The final whistle blows here and United fans go into ecstasy as their team celebrates a victory over Chelsea. The goal at the end of the first half by Hernandez set them on their before Drogba thought he had given his team hope. It was left to Park to deliver the knockout blow as Chelsea bow out of the last remaining competition they could win this season.
Three more minutes for Chelsea to endure as United look to play out the final moments of the game.
United marching towards the Champions League semi final with a fit squad which is beginning to include a number of in form players. They are keeping their treble dreams alive here while Chelsea may be managerless come the end of the season.
Drogba has had a good half here for Chelsea it begs the question what might have happened had he played from the start. Meanwhile Van der Sar makes a super save from Malouda's rasping drive.
Dare I say it, United looking comfortable again and probably should see this game out. Chelsea lacking the energy to chase them down with ten men.
Substitution Alex Paulo Ferreira
Have ten man Chelsea got enough in the tank to try and force their way back in the game once more? 10 minutes for Drogba and co. to go chasing. At the moment United playing keep ball though.
GOOOAAALLLLL!!!! That should be game over now. Ji-Sung Park, much maligned in some quarters but my how he enjoys a big game. The ball is played over to him on the left with far too much space. He controls perfectly and finishes with aplomb to halt the singing Chelsea faithful.
Assist Ryan Giggs
Goal Ji-Sung Park
GOOOOAAAALLLLL!!!! Maybe it won't be a procession. That man Drogba has scored an excellent goal. The through ball from Essien is good but Drogba's chested touch is superb and finishes between Van der Sar's legs. Game on!!!
Assist Michael Essien
Goal Didier Drogba
Substitution Nani Antonio Valencia
Well you have to say both Terry and Alex are lucky not to have been carded there as Nani wonderfully breezes through the two players' challenge before falling to the ground. This last 15 minutes would appear to be nothing else but a procession.
That will be game, set and match as Ramires is given his marching orders. After receiving a silly yellow card in the first half, the Brazilian clumsily challenges into the back of Nani who theatrically goes down but the referee has no hesitation in pulling out the second yellow card.
That probably should be game, set and match. Rooney is found wide on the right hand side and beautifully finds Giggs who has a free header from eight yards but he mistimes his header and Cech gets across to save.
Good save from Cech. A speculative ball into the Chelsea is headed clear by Alex but only to Nani who is shown inside on his right foot and shoots. The shot just bounces in front of Cech but he forces it wide.
The tempo of the game has dropped off dramatically from the first half as United try and usher Chelsea out of the competition rather than brutally knock them out.
United looking increasingly comfortable at the moment as Chelsea push, rather slowly, for a way back into the game. The visitors look bereft of ideas and the goal just before half time seems to have taken the wind right out of their sails here.
Substitution Nicolas Anelka Salomon Kalou
Decent save from Van der Sar again. A free kick on the right hand side and Drogba decides to shoot at goal. It looked like it might just be drifting wide but the Dutchman got across to block.
Yellow Card Patrice Evra
Already in his first few touches Drogba has shown more threat than Torres. He gets the ball 30 yards out and turns neatly before shooting which goes just wide of the goal. Van der Sar has it covered but an ounce of encouragement nonetheless.
The atmosphere in the ground appears to echo that of the Chelsea players at the moment. United fans sing to drown out their downbeat opponents and away players seem a little shell-shocked at the moment. they must get out of this slumber as soon as possible.
Quiet start to the half from both teams as Chelsea ponder their next move while United continue in the same vain they have in the rest of the game.
Can Drogba save Chelsea's ailing season and perhaps his manager's job. The situation isn't hugely different from the beginning of the game in which Chelsea still need two goals to go through.
Substitution Fernando Torres Didier Drogba
The cavalry has been called and Drogba is on for Torres. Big game for a big player.
Half time here and what a time to score for United. Chelsea have had the better of the exchanges but United lead. Ancelotti will need one hell of a half time team talk to pull this game around.
Well just as champions do, United have taken the lead when they probably haven't been the better team. What a huge goal that is from Hernandez.
GOOOOOOAAAAALLLLL!!!!! It isn't often said but excellent play from O'Shea. Rooney sprays a ball out to the right towards Giggs who neatly plays it to O'Shea who swivels on the ball and plays a delightful reverse ball for Giggs. The Welshmandrove into the area and instead of shooting wonderfully puts the ball at the back post for Hernandez, the poacher to put it away.
Assist Ryan Giggs
This game has been played at a real Premier League pace tonight and it has ebbed and flowed beautifully. United just having the better of things in the last couple of minutes.
Yellow Card John Terry
A little bit of quality has gone in the game though as the ball is given away freely by both sides as they look to punch and counter-punch.
Yellow Card Florent Malouda
Chelsea seem to have lost a little fluency in the last few minutes as first Ramires and then Lampard give the ball away cheaply.
Yellow Card Ramires
United just showing how dangerous they are on the counter attack again. A Chelsea attack ends up being an attacking thrust from United who have Rooney, Hernandes, Nani and Park all breaking at pace. It takes a Ramires tackle to bring Nani down to stop the move. Excellent game of football here this evening.
What a brilliant tackle out wide on the left by...Van der Sar of all people. Evra was caught out of position and through ball found Anelka in space but the 40 year old managed to sprint off his line and at full stretch slide to tackle Anelka and dispossess him.
Wow that was close. A United corner is headed away to Rooney who swivels on the ball and provides a wonderful for cross for Hernandez who dives in ahead of Cech to score only the offside flag to be raised. He was offside by a head, lucky break for Chelsea.
Chelsea really looking to exert their authority on the game and control the possession. They are certainly creating more chances than last week and look better balanced. Anelka the last person to close again for Chelsea with a half volley on his left foot which goes just over the bar.
Rooney is having to drop deeper and deeper to find space from the three stewards Ancelotti has employed. Their tactics look good at the moment.
Yellow Card John O'Shea
As well as Chelsea have played in the last few minutes, they do look very shaky at the back and they must defender better as a unit as the games goes on.
Another big chance for Chelsea, this time its Lampard who misses a guilt edged chance. Malouda drove inside and manages to find Lampard in space on the edge of the area but his side foot shot is weak and van der Sar gets down to it well.
First real chance and it goes to Chelsea. The cross comes in and seemingly slipping Torres still holds the ball up and lays it off for Anelka on the edge but his shot just skews wide.
Pretty open game here so far as United look to attack quickly whenever they get on the ball. This time Rooney out paces Cole on the right and plays a ball inside which Hernandez turns on towards the byline. His cross is fizzed into the area but Ramires is on hand to clear it to safety.
I've already mentioned it this evening but Alex looks a little ring rusty and he was beaten far to easily. Rooney played a good aerial ball for Park who turns passed Alex before luckily being crowded out in the area. Ferdinand looks like he is struggling and Smalling is warming up already.
It certainly looks like Chelsea are trying to stop Rooney having the ball so often with Ramires, Essien and Malouda all playing centrally. A danger that the team looks perhaps a little narrow though.
Good start from United as they look to attack Alex, just returning from injury. Sloppy play from Terry almost allows a chance for the home team before a poor Rooney cross aleviates any danger for Chelsea.
The early exchanges seem to suggest that Torres will be playing on his own with Anelka and an advanced Lampard supporting. Big call to change a system just before a game of this size.
We're underway here in front of a barely full Old Trafford as fans stuck on the M6 still make their way to the ground.
The beginning is almost upon us and perhaps only the sporting Gods know but surely Torres scoring his first goals for Chelsea in an away win would be too perfect for the West Londoners...
A day after stating that Antonio Valencia 'has everything' Ferguson has sprung a surprise and opted to leave the Ecuadorian out of his starting line-up in place of Nani. The calming influence of Ferdinand and Vidic will be huge for United this evening as they look to preserve their lead. Surely Rooney won't be given as much freedom in this leg as he was last Wednesday.
Carlo Ancelotti assured onlookers Sir Alex Ferguson's jibe yesterday, that Chelse were obsessed with winning the Champions League, was not true but the huge selection of £50m pound striker Fernando Torres over Didier Drogba looks a little strange, especially given that the team look to have reverted back to the successful 4-3-3 formation. The other big change is Alex comes back for first time since injury and it will be interesting to see if he is completely match fit because you can bet Javier Hernandez will try and stretch his legs as much as he can. Interestingly it is the first time that Malouda, Anelka and Torres have played together.
Chelsea line-up: Cech Ivanovic A Cole Terry Alex Essien Ramires Lampard Malouda Torres Anelka Subs: Turnbull, Ferreira, Benayoun, Mikel, Zhirkov, Drogba, Kalou
Manchester United line-up: Van der Sar Evra Ferdinand Vidic O'Shea Giggs Park Ji-Sung Carrick Nani Rooney Hernandez Subs: Kuszczak, Brown, Smalling, Scholes, Valencia, Gibson, Berbatov
Good evening everyone and a very warm welcome to Goal.com's live commentary of the week's huge game, where (as if you needed reminding) Chelsea travel north to their rivals Manchester United in the quarter finals of the Champions League.
Times In BST
Live Final scheduled Suspended Cancelled Postponed