Having played only one minute of senior football since September 2008, it would be fair to question Red Devils manager Sir Alex Ferguson's decision to play him from the start.
And less than six minutes after the kick-off the Ferguson put on his poker face as the 29-year-old
England midfielder limped off
and out of sight after delivering a tame ball from the right.
Bebe replaced Hargreaves, and although his contributions were mostly ineffective, he produced the best chance for United in the first half when his sharp effort inside the area was blocked.
United went into the game with a number of players, including Nemanja Vidic, Patrice Evra and Paul Scholes, suffering from a virus following the midweek Champions League trip to Turkey - and it showed.
The home side looked rattled following the early change to the system.
Ferguson's men found it hard to cope with Wolves' potency down the left, with Matt Jarvis again causing problems like he did against Manchester City last week.
The visitors came close to opening the scoring when Nenad Milijas's shot was deflected a foot wide of the United right-hand upright.
And a few minutes later Stephen Hunt only fractionally failed to connect with Jarvis's in-swinger into the six-yard area.
We took a gamble with Hargreaves - Phelan
When the goal came it was a surprise because United could not put together more than three passes let alone cause panic in the Wolves defence.
But it was experience of United that came to the fore, when Fletcher jinked his way in from the left and played a delicious ball which dissected the Wolves defence and found Park inside the area who stayed composed to slot past goalkeeper Marcus Hahnemann.
But those expecting United to build on that would have been left disappointed as the sloppiness of the opening 45 minutes returned to their play.
However, Wolves boss Mick McCarthy was still finding it hard to make in-roads and opted to make a change by bringing on Ebanks-Blake.
And within two minutes of coming on, the former United youth player had fired in the equaliser after Milijas's mis-hit shot arrived at his feet on the edge of the six-yard area.
McCarthy dispirited after 'heroic' defeat
The title challengers were rocked for the second time in the match and were looking at another valuable two points slip away.
They pressed forward in desperation, and with a few minutes left of the 90 were denied when captain Karl Henry made a glorious tackle on Gabriel Obertan who was about to rip open the net.
It looked game over, but then with two minutes of stoppage time played Park tried his luck by cutting in from the left before firing in.
90:00+4:28 The referee signals the end of the game.
90:00+2:24 Assist by Darren Fletcher.
90:00+2:24 GOAL - Ji-Sung Park:Man Utd 2 - 1 Wolverhampton Ji-Sung Park finds the net with a goal from deep inside the penalty box to the bottom right corner of the goal. Man Utd 2-1
90:00+0:42 Gabriel Obertan gives away a free kick for an unfair challenge on Christophe Berra. Direct free kick taken by Marcus Hahnemann.
90:00+0:17 Ji-Sung Park sends in a cross, Richard Stearman makes a clearance.
89:54 Paul Scholes takes a shot. Richard Stearman gets a block in.
89:02 The ball is delivered by Wes Brown, clearance by Christophe Berra.
86:11 Ji-Sung Park crosses the ball, clearance by Matthew Jarvis.
83:29 Effort on goal by Gabriel Obertan from inside the penalty box misses to the right of the target.
83:19 Federico Macheda produces a cross, clearance by Richard Stearman.
82:25 Marcus Hahnemann takes the direct free kick.
81:26 Booking Booking for Javier Hernandez for unsporting behaviour.
80:41 The assistant referee signals for offside against Javier Hernandez. Marcus Hahnemann takes the indirect free kick.
80:12 The ball is sent over by Wes Brown, Christophe Berra manages to make a clearance.
Correction - 79:11 Effort on goal by Steven Fletcher from deep inside the area goes harmlessly over the bar.
79:11 Steven Fletcher produces a left-footed shot from inside the area that clears the crossbar.
77:37 Patrice Evra produces a cross, Richard Stearman manages to make a clearance.
76:11 Substitution Michael Mancienne on for Nenad Milijas.
74:50 Corner taken by Gabriel Obertan from the right by-line.
74:36 Darren Fletcher takes a shot. Richard Stearman gets a block in.
73:37 Substitution Federico Macheda comes on in place of Tiago Bebe.
73:37 Substitution John O'Shea goes off and Paul Scholes comes on.
71:07 Corner taken by Gabriel Obertan from the left by-line.
70:50 Javier Hernandez takes a shot. Save by Marcus Hahnemann.
69:09 Unfair challenge on Tiago Bebe by Karl Henry results in a free kick. Wes Brown restarts play with the free kick.
67:52 Steven Fletcher takes a shot. Sylvan Ebanks-Blake gets a block in.
65:17 Assist on the goal came from Nenad Milijas.
65:17 GOAL - Sylvan Ebanks-Blake:Man Utd 1 - 1 Wolverhampton Goal scored by Sylvan Ebanks-Blake from close range to the bottom left corner of the goal. Man Utd 1-1 Wolverhampton.
64:51 A cross is delivered by Ji-Sung Park. Gabriel Obertan crosses the ball, clearance by Stephen Ward.
63:54 Ji-Sung Park fouled by David Edwards, the ref awards a free kick. Direct free kick taken by Patrice Evra.
63:54 Substitution (Wolverhampton) makes a substitution, with Steven Fletcher coming on for David Edwards.
63:54 Substitution Sylvan Ebanks-Blake on for Stephen Hunt.
63:25 Javier Hernandez takes a shot. Blocked by Nenad Milijas.
62:41 Kevin Doyle produces a cross.
Correction - 60:51 Direct free kick taken by Rio Ferdinand. Nenad Milijas handles the ball and concedes a free kick. Tiago Bebe takes a shot.
Save made by Marcus Hahnemann.
60:47 Karl Henry concedes a free kick for a foul on Ji-Sung Park. Rio Ferdinand restarts play with the free kick.
58:36 Shot from just outside the area by Javier Hernandez misses to the right of the target.
54:47 The ball is crossed by Tiago Bebe.
49:11 Ji-Sung Park fouled by Stephen Hunt, the ref awards a free kick. John O'Shea takes the direct free kick.
48:10 The ball is swung over by Patrice Evra, blocked by Kevin Foley. Corner from left by-line taken by Gabriel Obertan.
46:42 Matthew Jarvis produces a cross, Nemanja Vidic manages to make a clearance.
45:01 The referee gets the second half started.
45:00+2:05 The half-time whistle blows.
45:00+1:49 Free kick awarded for a foul by Karl Henry on Javier Hernandez. Rio Ferdinand takes the direct free kick.
45:00+1:22 Kevin Doyle fouled by Nemanja Vidic, the ref awards a free kick. Nenad Milijas crosses the ball in from the free kick, John
O'Shea manages to make a clearance.
44:53 The assist for the goal came from Darren Fletcher.
44:53 GOAL - Ji-Sung Park:Man Utd 1 - 0 Wolverhampton Ji-Sung Park gets on the score sheet with a goal from inside the box low into the middle of the goal. Man Utd 1-0 Wolverhampton.
43:33 The ball is delivered by Ji-Sung Park, clearance by Christophe Berra.
42:59 Centre by Matthew Jarvis, John O'Shea makes a clearance.
41:54 Free kick awarded for an unfair challenge on Javier Hernandez by Christophe Berra. Darren Fletcher crosses the ball in from
the free kick, clearance by David Edwards.
41:13 Matthew Jarvis produces a cross.
40:26 Tiago Bebe sends in a cross.
38:21 The ball is sent over by Gabriel Obertan. Wes Brown delivers the ball, clearance by Richard Stearman.
37:45 The ball is swung over by Stephen Ward, clearance by Rio Ferdinand.
35:27 Stephen Ward concedes a free kick for a foul on Tiago Bebe. The free kick is swung in left-footed by Patrice Evra, save made
by Marcus Hahnemann.
33:03 The ball is crossed by Tiago Bebe, blocked by Stephen Ward.
32:47 The ball is swung over by Ji-Sung Park, blocked by Marcus Hahnemann.
31:35 The official flags Gabriel Obertan offside. Free kick taken by Marcus Hahnemann.
30:57 Kevin Foley challenges Patrice Evra unfairly and gives away a free kick. Patrice Evra takes the direct free kick.
29:34 Darren Fletcher produces a cross, comfortable save by Marcus Hahnemann.
28:35 Centre by Darren Fletcher.
28:10 The ball is swung over by Kevin Doyle, Rio Ferdinand manages to make a clearance.
27:13 Karl Henry challenges Javier Hernandez unfairly and gives away a free kick. John O'Shea restarts play with the free kick.
25:43 Matthew Jarvis delivers a pass corner to short, clearance made by Rio Ferdinand.
Correction - 25:30 Nenad Milijas takes a shot. Nemanja Vidic gets a block in.
25:30 Nenad Milijas takes a shot. Rio Ferdinand gets a block in.
24:55 Shot by Nenad Milijas from deep inside the penalty area misses wide to the left of the target.
24:04 Foul by Wes Brown on Kevin Doyle, free kick awarded. The free kick is swung in right-footed by Matthew Jarvis, Nemanja Vidic
manages to make a clearance.
23:12 Gabriel Obertan has an effort at goal from outside the box which goes wide left of the goal.
22:28 Matthew Jarvis takes a shot. Blocked by Wes Brown. Matthew Jarvis decides to take a short corner, A cross is delivered by
Stephen Ward, Gabriel Obertan gets a block in.
20:43 Javier Hernandez concedes a free kick for a foul on Richard Stearman. Richard Stearman restarts play with the free kick.
19:15 Free kick awarded for an unfair challenge on Tiago Bebe by Stephen Ward. Wes Brown takes the direct free kick. The referee
blows for offside. Christophe Berra restarts play with the free kick.
16:56 A cross is delivered by Tiago Bebe.
15:28 Free kick awarded for an unfair challenge on Stephen Hunt by John O'Shea. Free kick crossed left-footed by Kevin Foley, Rio
Ferdinand fouled by Richard Stearman, the ref awards a free kick. Edwin Van der Sar takes the direct free kick.
14:23 Ji-Sung Park crosses the ball, Nenad Milijas makes a clearance. Ji-Sung Park produces a right-footed shot from just outside
the area that goes harmlessly over the bar.
14:02 Patrice Evra takes a shot. Blocked by Kevin Foley.
13:49 John O'Shea takes a shot. Richard Stearman gets a block in.
12:05 Tiago Bebe takes a shot. Richard Stearman gets a block in.
11:08 Tiago Bebe sends in a cross.
9:17 Substitution Tiago Bebe is brought on as a substitute for Owen Hargreaves.
8:35 The ball is delivered by Kevin Foley, clearance made by Wes Brown.
6:06 Javier Hernandez is caught offside. Indirect free kick taken by Marcus Hahnemann.
5:12 The ball is delivered by Nenad Milijas, Stephen Hunt takes a shot. Save by Edwin Van der Sar.
4:18 A cross is delivered by Owen Hargreaves, clearance by Christophe Berra. Owen Hargreaves produces a cross, save made by Marcus
3:14 Karl Henry takes a shot. Save by Edwin Van der Sar.
1:30 Karl Henry fouled by John O'Shea, the ref awards a free kick. Kevin Foley restarts play with the free kick.
0:00 The game gets underway.
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