FT AC Milan 1-0 Celtic (agg 1-0)
FT Arsenal 1-1 PSV (agg 1-2)
FT Bayern Munich 2-1 Real Madrid (agg 4-4)
FT Man Utd 1-0 Lille (agg 2-0)
GOALFLASHES AND MAJOR INCIDENTS (all times GMT)
2215: FULL-TIME AC Milan 1-0 Celtic
The final whistle goes at the San Siro. A terrific effort from Gordon Strachan's men and he shows his appreciation by joining the field with his shattered players. A moment of brilliance from Kaka proved the difference between the two sides.
2213: Lee Naylor, who is still looking for his first goal for Celtic, cannot end that search as he blasts a free-kick well wide of Dida's goal.
2212: Celtic are showing their frustrations as Milan use all the tricks of the trade to try and see out the remaining few minutes.
2210: We are into the last five minutes and Celtic's legs are looking more weary by the minute. Aiden McGeady plays a sloppy pass that is cut out easily and Milan are happy just to keep possession.
2208: Terrific spirit from a tiring Celtic side but Aiden McGeady's shot is blocked by a red-and-black wall of defenders.
2205: A chance for Celtic to test the Milan defence but from Thomas Gravesen's corner Stephen McManus is given a little nudge which causes him to handle in the area.
2203: They are not shy when it comes to having a pop at goal these Milan boys. Substitute Cristian Brocchi registers their 33 effort at goal, but it is high and wide of the target.
2200: Milan are first to attack as Clarence Seedorf attempts the most ambitious of strikes. Had it gone in it would have been good enough to grace any Champions League tie. As it was it ended in the stands.
2159: Kenny Miller is clearly keen. He is on the pitch before the official gets a chance to check his boots and he is called back for a quick look. Everything is in order and the second period kicks off.
2158: Celtic have one substitution and Gordon Strachan has Kenny Miller ready for action.
2157: The first period of extra-time ends. Time is running out on Celtic's European voyage.
2154: Celtic still look capable of getting a goal as Craig Beattie heads over - the problem maybe stopping Milan from getting another as weary bodies litter the park.
2152: Andrea Pirlo brings out the best in Artur Boruc once again as the Polish keeper throws himself to his left to keep out the Italian's curling shot.
2151: Craig Beattie comes on to replace Evander Sno as Celtic look to throw everything at Milan in an effort to snatch the all-important away goal that would see them through.
2148: Andrea Pirlo nearly makes it two for Milan, bursting down the right wing and driving a low shot to Artur Boruc's near post but the Celtic keeper does well to turn the ball away for a corner.
2143: GOAL AC Milan 1-0 Celtic
What Milan failed to do in 180 minutes of normal time they manage in less than three minutes of extra-time. Heartache for Celtic but it was a wonderful individual effort from Kaka, who finishes off a great driving run through the heart of the Celtic defence by slipping the ball through the legs of an onrushing Artur Boruc.
2141: Extra-time is under way at the San Siro.
2141: FULL-TIME Bayern Munich 2-1 Real Madrid
Bayern just about hold on to book their place in the last eight of the competition on the away goals rule.
2141: FULL-TIME Man Utd 1-0 Lille
The final whistle goes. A relatively trouble-free night for United that will be hopefully be remembered for Henrik Larsson's leaving present rather than any serious damage to Mikael Silvestre.
2140: Manchester United's march to the next stage is held up by a bad injury to Mikael Silvestre. The defender crashes to the ground under a challenge from Efstathios Tavlaridis and the Frenchman falls badly. After several minutes he is stretchered off.
2137: FULL-TIME Arsenal 1-1 PSV
Arsenal's European campaign ends in total frustration at the Emirates. Missed chances and a moment of defensive madness sees them miss the chance of making the last eight.
2136: The final whistle goes at the San Siro and a tantalising 30 minutes of extra-time awaits between Milan and Celtic, who have failed to score in 180 minutes of football.
2134: Real Madrid have the ball in the net through Sergio Ramos but they are denied a winner as the referee seemingly spots a handball.
2131: Milan escape a decent penalty shout but are throwing everything at Celtic and Artur Boruc is rooted to the spot when Kaka's blistering strike comes off the underside of his bar and bounces to safety.
2129: GOAL Bayern Munich 2-1 Real Madrid
Ruud van Nistelrooy squares things up from the spot, but Real are still behind on away goals with time running out.
2127: A lifeline for Real as Robinho receives a pass from Van Nistelrooy and goes to ground under a challenge from Lucio. Referee Lubos Michel points to spot, although it is seemingly a harsh decision. Mark van Bommel, booked early on, protests his case and earns himself a second yellow.
2126: The Emirates has gone flat as the home fans realise their European dreams - and their hopes of silverware - is all but over. Arsenal need two goals in three minutes.
2124: GOAL Arsenal 1-1 PSV
A disaster for Arsenal as PSV get the crucial away goal through a towering Alex header with seven minutes to go. He gets up highest to head in Edison Mendez's free-kick that flies past a stranded Jens Lehmann.
2124: It looks like the job has been done at Old Trafford as Sir Alex Ferguson takes off Cristiano Ronaldo and Wayne Rooney. Well, you don't get teams scoring two late goals in the Champions League do you?
2122: An uncharacteristically subdued Rino Gattuso is replaced by the more attack-minded Christian Brocchi as Milan gamble on grabbing that all-elusive goal.
2122: A rare chance for Celtic with 15 minutes to go as Thomas Gravesen's curled cross from the right evades everyone and Aiden McGeady is put off going for it by Massimo Oddo's slip.
2121: Thierry Henry shakes off his niggles to fire in a free-kick that a diving Gomes keeps out.
2119: Arsenal are well on top at the Emirates as PSV survive a goalmouth scramble, but there are worrying signs as Thierry Henry looks to have picked up a knock.
2117: Milan are slowly turning up the pressure on Celtic and Alberto Gilardino comes on for Filippo Inzaghi as the Italians look to avoid extra-time.
2116: Manchester United, who look headed for the quarters, bring off Henrik Larsson. He gets a standing ovation from almost everyone inside Old Trafford, including manager Sir Alex Ferguson who looks proud as punch.
2114: GOAL Man Utd 1-0 Lille
United get the crucial goal and who else but Henrik Larsson in his last game at Old Trafford? It is brilliantly made by Cristiano Ronaldo on the left who swings in a pinpoint cross for Larsson to expertly head in.
2110: GOAL Bayern Munich 2-0 Real Madrid
Just as Real looked to be gaining the ascendancy Bayern increase their advantage when Lucio gets up well to power in a header.
2109: With less than half an hour to go we are looking at extra-time at Arsenal and Milan, with the ties at Old Trafford and the Allianz Arena also delicately poised.
2108: Thomas Gravesen nearly makes an instant impact with a thundering goal-bound shot from the edge of the box which is heroically blocked by Massimo Oddo.
2107: Celtic are coming under increasing pressure so boss Gordon Strachan makes his first change of the night, Thomas Gravesen replacing an ineffective Jiri Jarosik.
2106: Arsenal manager Arsene Wenger knows the drama has only started and he prepares to play his trump card in Thierry Henry.
2103: It is non-stop action at the Emirates as Emmanuel Adebayor blasts just off target at one end and then Jason Culina sets up a chance for Edison Mendez.
2101: A chance for Real as Raul's cross is headed goalwards by Ruud van Nistelrooy, but athletically tipped away by Oliver Kahn.
2100: GOAL Arsenal 1-0 PSV
Arsenal get the breakthrough and level the tie courtesy of an own goal from Alex. Denilson's corner misses everyone and hits Alex who can only watch the ball fall into the open net.
2057: A quiet period at the Allianz Arena but the trumpeter belts out a decent rendition of Bonnie Tyler's "It's a Heartache". It certainly will be for one of these European giants tonight.
2057: Marek Jankulovski streaks down the left flank and hits a pinpoint cross to the near post where Pippo Inzaghi meets it on the half-volley - but his flashing shot hits the Celtic side-netting and the game remains a fascinating stalemate.
2055: Julio Baptista goes to ground on the edge of the box after clashing with Sun Xiang. The Arsenal fans want a penalty but referee Alain Hamer wants none of it. Wishful thinking by the Gunners I'm afraid.
2052: The second half kicks off late in Germany and Bayern are slow to start. This time it takes them a whole 29 seconds to open up Real's defence, but Mark van Bommel sees his shot well saved by Iker Casillas.
2051: Celtic start the second half strongly but it is Milan who nearly break the deadlock. Kaka again has space in the box but the midfielder dallies on the ball and Celtic scramble it clear.
2049: An early warning for Manchester United that this tie is far from over as Peter Odemwingie hits the post.
2047: We are back up and running at Milan, Manchester United and Arsenal, where Thierry Henry is still sat on the bench in his bright white tracksuit.
2043: The big debate over whether Roy Makaay's goal was timed at 10 or 11 seconds is finally settled. The stopclock has it at 10.2 seconds, which is quick by anyone's standards.
PLAYER RATER: Cristiano Ronaldo (8.12) is again the star of the show for Manchester United. Kolo Toure (7.21) is leading the voting for Arsenal, possibly for his attacking contribution as much as for his defending. At opposite ends of the field for Celtic, Artur Boruc (8.00) and Jan Vennegoor of Hesselink (7.80) have shone. Register your votes using the links below:
2034: On the stroke of half-time Raul lashes in a volley that just nibbles the outside of the woodwork. After conceding so early Madrid have finally found a bit of form just as the half-time whistle goes.
2033: Half-time at the San Siro. Celtic have stood up well to Milan's fast, fluid attack and have also threatened themselves. Celtic have held their own and their hopes of reaching the last eight are very much alive and kicking.
2032: The half-time whistle goes at Arsenal and Manchester United. A frustrating evening so far for the two English clubs.
2030: A chance for Celtic as Jan Vennegoor of Hesselink gets his head to a Paul Telfer cross and the ball pinballs between a pair of Milan defenders with Massimo Oddo almost inadvertently deflecting the ball past Dida from point-blank range.
2029: Two in a minute for Real - chances that is - as Guti finds Ruud van Nistelrooy unmarked in the box, but his downward header fails to seriously trouble Oliver Kahn.
2028: Just as Celtic were starting to look comfortable Kaka floats a teasing cross into their box which Massimo Ambrosini heads against Artur Boruc's bar with the Celtic keeper beaten. The offside flag goes up but the Italian looked just on, another narrow escape for Celtic.
2028: Real get their first sight on goal as substitute Guti pokes wide after a good move from the Spaniards.
2026: Cristiano Ronaldo goes into the book for a dive in the Lille box. He takes the news about as well as a small child who has just had his bag of sweets taken from him.
2024: Iker Casillas to the Real rescue again, this time saving from a Daniel Van Buyten header.
2023: Celtic have never kept a clean-sheet on their Champions League travels. They have conceded nine goals in three away games this season alone, but they are holding Milan at bay quite comfortably with 10 minutes of the first half to play.
2021: We nearly had another diplomatic incident involving Lille as Kader Keita is wrongly booked following a foul on Cristiano Ronaldo. Keita goes semi-crazy before referee Luis Medina Cantalejo has a change of heart and shows team-mate Mathieu Chalme a yellow instead.
2020: Over at Old Trafford Manchester United are looking pretty comfortable as Michael Carrick flashes a shot wide of the post.
2018: Real boss Fabio Capello is obviously not happy with how things are going and he withdraws Emerson in favour of Guti.
2017: PSV coach Ronald Koeman look pensive on the bench as Arsenal are battering his side.
2013: It looks like a familiar tale at the Emirates. Arsenal having all the chances but struggling to finish them off. This time it is Julio Baptista who volleys acrobatically over the bar.
2013: Goalscorer Roy Makaay is proving a handful for Real's shaky defence and he springs their offside trap before seeing his shot saved by the legs of Iker Casillas.
2011: Dangerous times for Celtic as Lee Naylor slides in to take Clarence Seedorf's cross off the toe of Filippo Inzaghi as he prepares to slot the ball home from four yards out.
2010: Mark van Bommel is booked, meaning he will miss the first leg of Bayern's quarter-final if they get through.
2008: Arsenal are getting closer to the goal they need. Kolo Toure has a right-foot shot well saved by Gomez and then Cesc Fabregas crosses for Emmanuel Adebayor but he heads wide.
2007: Over in Germany it is all Bayern and Lukas Podolski forces a good save out of Iker Casillas.
2005: Celtic have started well, harrying their illustrious opponents, but they then allow Milan danger-man Kaka too much space in the box ¿ but the Brazilian lashes the ball wildly over the bar from 12 yards out.
2003: A good chance for Arsenal as Cesc Fabregas picks out Emmanuel Adebayor but he is unable to apply the finishing touch.
2003: Tennis legend Boris Becker is spotted in the crowd at Bayern Munich puffing on a fag. You wouldn't get away with that in England, Boris.
2003: Lille survive a scare as Manchester United put their jittery defence under pressure. Wayne Rooney receives Paul Scholes's pass from the right only to see Mathieu Chalme block his shot. Then, John O'Shea hits the bar while Lille keeper Tony Sylva is all at sea.
2001: Roy Makaay's early goal has been timed at 10 seconds and makes it the fastest goal in Champions League history.
2000: Williams Gallas returns, hopefully with a new set of lenses in.
1958: Arsenal defender William Gallas is forced off the pitch after seemingly losing a contact lens.
1958: Jan Vennegoor of Hesselink is bundled to the ground on the left-hand edge of the Milan box. Free-kick specialist Shunsuke Nakamura whips in a dangerous ball. It eludes Jiri Jarosik at the back post but Paolo Maldini looked to have handled the ball - a clear penalty shout for Celtic.
1955: Arsenal have started nervously but they nearly cancel out PSV's first-leg lead when Kolo Toure bulldozers his way into a wonderful scoring position. But he shows why he spends most of the game at the other end of the pitch with a quite shocking finish.
1953: Of course Celtic do not even need a win to go through. A score draw would seal their place in the quarters.
1952: Celtic, who look to be playing a 4-2-3-1 formation, have never won away from home in the Champions League. From 12 games they have only managed one measly draw and 11 defeats. What a night to break that duck?
1950: A nervy start for Celtic as Kaka is given too much space in the Celtic box but his curled shot is brilliantly tipped away by Polish keeper Artur Boruc.
1949: Makaay's goal, which may have just stretched to 11 seconds, puts the Germans in front on away goals. But Real have plenty of time to get back into it.
1947: Bayern Munich 1-0 Real Madrid
What a start for Bayern. Roy Makaay scores after about 10 seconds. A mistake from Robert Carlos is latched upon by Hasan Salihamidzic and he squares for Makaay to sidefoot home.
1946: After a bit of a delay at Arsenal we are off and running.
1943: The teams are lined up at the Emirates and San Siro. Plenty of nervous jumping up and down by the players.
1940: The teams are in the tunnel at Old Trafford. Skipper Gary Neville has got his game face on this evening. Watch out Lille.
1935: The only game not featuring a British side tonight is not a bad little match-up. Bayern Munich and Real Madrid, with 13 European Cup trophies between them, face off in Germany.
1931: There was also a bit of a setback for Manchester United with the news Louis Saha will be out for four weeks with a hamstring injury.
1930: There was a big surprise at Old Trafford, with Ryan Giggs left out. Who will take the quick free-kicks for the Red Devils this evening?
1928: Manchester United, Arsenal and Celtic will be looking to join Chelsea and Liverpool in the quarter-finals of the tournament.
1926: We have a fascinating night of Champions League action ahead of us, with three British clubs in action and still with a reasonable chance of progressing.
Arsenal name skipper Thierry Henry on the bench, so Julio Baptista continues to deputise up front and is joined by Emmanuel Adebayor. Former Liverpool defender Jan Kromkamp and ex-Newcastle striker Patrick Kluivert miss out for PSV, but there was a start for China midfielder Sun Xiang.
Manchester United surprisingly leave first-leg scorer Ryan Giggs on the bench, while Mikael Silvestre is preferred to Gabriel Heinze at left-back in the absence of Patrice Evra. Lille, who are without Mathieu Bodmer and Yohan Cabaye, are able to call upon Kader Keita after he missed the first leg through suspension.
Celtic make two changes from the first leg, with Mark Wilson replaced at right-back by Paul Telfer and Jiri Jarosik preferred to Kenny Miller. AC Milan recall Paolo Maldini after he was rested at the weekend.
Bayern Munich defender Lucio and midfielder Hasan Salihamidzic are passed fit to play. Real Madrid are without Fabio Cannavaro so Sergio Ramos joins Ivan Helguera in defence.