Manchester United suffered a new injury blow when Ryan Giggs fractured a cheekbone in the disappointing Champions League draw with Lille.
Giggs could be out for six weeks after a collision in the goalless stalemate.
United boss Sir Alex Ferguson said: "It is a horrible thing to happen but at this stage, it is too early to say what we are going to do about it.
"I think he got caught by an elbow. It was only when we took him off we realised the extent of the problem."
Giggs joins a lengthy United injury list, which also includes skipper Roy Keane, Gabriel Heinze, Gary Neville and Quinton Fortune, plus Wes Brown and Louis Saha, whose comebacks are imminent at least.
"Wes and Louis have started training and could be involved against Barnet next week," said Ferguson.
"Gary has started running but it will be two weeks before he is anywhere near the football part. But Roy is nowhere near and Quinton isn't either."
United also lost Paul Scholes, who was sent off in the second half for two bookable offences.
Ferguson said: "I would have to see the incidents again but Paul conceded three fouls all night, one of which was for a handball when he clearly headed it, and he gets sent off, while their number four (Efstathios Tavlaridis) committed how many fouls and didn't even get booked.
"It is a difficult one to call but in European football, some referees are very strict - and he was one of them."
United were left frustrated by Lille's lack of adventure and Ferguson said: "Let's be honest. They never tried to beat us.
"We just had to be patient and hope we got an opportunity. I think they will play in exactly the same way at the Stade de France."
Villarreal's draw with Benfica at least maintained United's position at the head of Group D and a win and two draws from their remaining three fixtures will virtually guarantee a passage into the last 16.
Lille coach Claude Puel admits his side may have missed the chance for a crucial win.
He said: "We missed a chance. There was an element of surprise which we won't have at the Stade de France and we could have had all three points."