To be honest, it was all over after the first leg, but City confirm their place in the final thanks to two goals from Negredo and one from Aguero. Stay with us for a full report and all the best reaction.
90+1 Chris Foy brings the contest to a close. City are at Wembley, where they will face either Manchester United or Sunderland.
There will be just one minute of added time.
Kolarov gets to the byline and fires in a low cross, which Johnson puts behind for a corner.
89 Warm applause as Diame is carried off and down the tunnel and Jack Collison is sent on. Allardyce will hope that he does not have a major new injury to contend with after what appeared to be an innocuous clash.
Not looking good for Diame, with the stretcher now on for the West Ham man.
Tonight's official attendance is 14,390. Sparse, but understandable.
Now Diame is down and needing some treatment following a challenge with Kolarov.
Negredo is back on the field, but does not look 100 per cent happy and is still holding his right shoulder.
Negredo is back onto his feet although still looks rather uncomfortable. West Ham win a corner at the other end of the field, but it comes to nothing.
Negredo takes a tumble under pressure from Tomkins, with the officials unimpressed. The striker looks to have landed awkwardly and is now being treated off the field.
Good play from Diame sets up Cole with his back to goal on the edge of the six-yard box, he manages to turn and get his shot away only for Clichy to block, with Downing unable to control the follow-up.
Nice play from Rodwell out on the left to find Negredo, but for once the striker's touch lets him down as his attempted pass only goes out for a throw.
79 Final change for City, with Kolarov coming on for Jesus Navas.
City gift possession to Carlton Cole, but his attempted diagonal pass towards Downing is easily cut out.
Navas misses a glorious chance to make it 4-0, smashing wildly over the bar when well placed in the box after being found by Negredo's nut-meg on Tomkins.
Downing makes space for another cross from the left which is just too high for Diame, before Cole nods wide from the resulting corner when he really should have tested Pantilimon.
Lovely pass from Clichy to find Rodwell in the box. He is held up by Tomkins before Navas takes over and feeds the on-rushing Fernandinho who smashes over the top from outside the area.
Nolan attempts an overhead kick from a Cole flick on in the box, but only finds Pantilimon and the flag is already up.
Clever free-kick routine from City sees Lopes play a one-two with Navas, only to get his attempted cross wrong. Jaaskelainen has the ball covered as it strikes the outside of the angle of post and bar and goes out for a goal-kick.
Nice touch from Jovetic to find Lopes, but the teenager's pass out towards Negredo on the right wing fails to find the striker.
Diame then has the chance to work the keeper once again from the right, but gets his cross all wrong and it goes out for a goal-kick.
Pantilimon is called into action, rising above Cole to claim Downing's cross from the left flank.
The strength in depth in Manuel Pellegrini's squad really must be the envy of managers throughout Europe.
65 Stevan Jovetic comes on, with Aguero making way.
64 Clichy goes into the book for bringing down Morrison in full flow.
63 Jack Rodwell comes on for Javi Garcia. Good to see him back in action.
Concern for West Ham with Diame down and undergoing some treatment, but he is OK to continue.
Excellent run from Morrison as he weaves his way into the box and then pulls the trigger, only to be denied by an excellent sliding block from Lescott.
59 That was simply brilliant from Negredo. He showed incredible strength to hold off both Johnson and Taylor to power his way into the box before demonstrating superb finesse to lift the ball over Jaaskelainen and into the net.
59 GOAL FOR CITY!!!! Negredo once again!
Aguero is freed into space out on the left. He plays a pass into the feet of Negredo with his back to goal, with the big striker unable to dig it out and West Ham can clear.
Morrison is the man who takes responsibility, but he fires his effort straight into the City wall.
Sloppy play from Nastastic as he allows the ball to run under his foot, before fouling Diarra as he attempts to shoot. Free-kick to the Hammers in a very dangerous position just outside the area.
Lovely pass from Fernandinho to release Navas down the right. He has time to pick a pass into the box, with Negredo, Aguero and Lopes all available, but he puts the ball too close to Jaaskelainen.
Clichy's cross from the left is flicked on by Nastasic but beyond Lopes. He retrieves the ball and finds Navas, who can only run the ball out of play.
Good play from Carlton Cole as he gets in behind Lescott and then turns Nastasic before drawing a good save from Pantilimon at his near post.
West Ham appeals for a penalty are waved away as Morrison goes to ground over Lescott's outstretched leg in the area.
Good play from Roger Johnson, holding off Negredo on the edge of the box and then clearing his lines.
47 Joe Cole makes way for Downing, and he heads straight down the tunnel, which suggests he had hoped to play though an injury niggle, but was unable to do so.
It looks like West Ham are planning another change, with Stewart Downing stipped and ready to come on.
West Ham get the second period under way.
The players are back for the second half, with Carlton Cole on for Andy Carroll.
45+2 Pantilimon is back on his feet to take the free-kick, with Chris Foy then bringing the half to a close.
Carroll connects with Pantilimon as they contest an aerial ball, with the City goalkeeper left in a heap on the turf.
One additional minute will be played.
Good play from Jaaskelainen as he races from his line to gather the ball on the edge of his own box just ahead of Lopes, who had burst clear onto Navas' lovely pass.
Neat one-two attempted by Aguero and Negredo on the edge of the West Ham box, but Rat gets an important foot in to clear.
Aguero is flagged offside as he breaks in behind from Navas' pass. The City striker is unimpressed and replays show it was a very tight call.
Navas goes for the near post, but his attempt is hacked away and West Ham have a respite from the City pressure as they earn a free-kick in their own half.
Johnson is forced to hack clear from under his own bar after a good cross in from the right from Navas. Corner to City.
Negredo takes the free-kick duties but smashes his effort straight into Joe Cole in the West Ham wall.
37 Great play from Lopes to out-muscle Diarra, before the West Ham man gives away a free-kick in a dangerous position and is booked for his troubles.
Navas and Aguero combine, before the striker goes to ground briefly looking in some pain. City put the ball out, but Aguero is quickly back onto his feet.
Diarra goes to ground under fairly minimal contact from Lopes in his own half and earns a free kick, before Carroll is flagged offside.
Morrison closes down Navas in the centre of the field and you can clearly hear the shout of 'man on' from the touchline. It's gone a bit quiet in here.
Aguero jumped into that tackle with Tomkins and caught the Hammers defender on the ankle. Didn't look good at all on the replay.
31 Nasty challenge from Aguero on Tomkins earns the Argentine striker a yellow card.
Lescott deals with Rat's long ball down their line with care under pressure from Carroll, eventually heading back to Pantilimon.
Quick throw from Jesus Navas catches West Ham napping, he finds Negredo who gets the break of the ball before drilling a low shot into Jaaskelainen's chest.
Carroll leaves Nastasic in a heap on the floor as he leaps into the Man City defender, but he is soon back on his feet to take the resulting free-kick.
24 Lovely skill from Aguero to take the ball away from two defenders, draw Jaaskelainen and then dink home. But the goal owed much to Marcos Lopes, who burst forward and weaved away from several challenges before feeding the striker. That's two assists tonight for the youngster.
24 GOAL FOR MAN CITY!!! AGUERO!!!
Morrison attempts to clip a ball over the top of the City defence to Nolan, but gets too much on the pass and it drifts out of play.
In fairness to West Ham, their response to the early goal has been good, and they've carved out some half-chances. However, the still look susceptible at the back.
Diame cuts in from the right, earns a yard of space against Nastasic and gets in a shot on target which is straight at Pantilimon.
West Ham's defence hold firm under pressure from City and Rat clears their lines.
Aguero forces a good save out of Jaaskelainen with a driving run and low shot which the keeper has to tip behind for a corner.
Navas and Negredo combine, with the latter feeding the ball in towards Aguero, but Johnson is able to clear on this occasion.
Solid defensive play from Lopes to put a halt to Tyalor's run. Diame picks up the ball and swings over a good cross which Carroll heads over the bar.
Taylor's corner goes all the way through to Tomkins at the far post. He heads back across the area, but Nastasic clears his lines.
Carroll flicks on a long ball to the edge of the area and Lescott has to concede a corner.
Half a chance for Diame as he seizes on a loose ball in the area, only to smash his shot well over Pantilimon's bar.
Taylor attempts to combine with Diame on the right flank, only for Nastasic to come across and clear.
Cole receives possession out on the left, but Boyata is across to knock the ball out for a throw.
Good skill from Aguero as he stops the ball on the edge of the area before leaving Johnson for dead and smashing a shot wide of the near post.
Diame feeds Taylor again down the left and he swings over another cross, but it is beyond his team-mates in the centre of the box.
West Ham have the ball in the net as they look for a way back into the game, but Nolan's close range finish from Taylor's cross is correctly ruled out for offside.
So, so, simple for Man City, and another defensive horror show for West Ham. A routine cross from the right by youngster Marcos Lopes picks out Negredo unmarked some eight yards out and he heads beyond Jaaskelainen.
3 GOAL TO MAN CITY!!!! Negredo.
Johnson, who had such a torrid time in the first leg, rolls the ball back to Jaaskelainen, who launches a clearance down field.
Early touches in defence for Lescott and Boyata, two members of Pellegrini's squad who feature more rarely than some others.
Man City get the contest under way.
As you'd expect, Upton Park is far from full tonight, but the fans who have made the effort are in good voice.
The two teams emerge from the tunnel and make their way out onto the Upton Park pitch.
Sam Allarydce has told Sky Sports that the plan is to give Andy Carroll 45 minutes initially, then see if he can get to the hour mark on his first start of the season.
Deano Carney writes: "Hope my beloved City win, and I'm going for a 5-2 win with Aguero (2), Negredo (2) and Navas scoring. Come on you Blues!"
Ian Ashman has been in touch from Spain to say: "It's nice to youngsters Lopes and Boyata included in the starting line up. I am looking forward to seeing Jovetic get on at some stage. I am going for a 4-1 win to my beloved City."
Lyndon Roberts writes: "I wonder what the odds on Andy Carroll getting injured are this evening? Not that I'd wish that on anyone but I suspect he could become the new Redknapp/Woodgate/Owen. I'd rather he became the striker England haven't had since Owen."
The winners of Wednesday's second semi-final between Manchester United and Sunderland will meet City (or West Ham!) at Wembley on March 2, with the Black Cats currently holding a 2-1 lead from the first leg.
If you fancy a flutter on tonight's clash, then Sky Bet have a whole host of markets available. West Ham can be backed at 6/1 to win in 90 minutes tonight, the draw is on offer at 4/1 and Man City are the 2/5 favourites to triumph.
And Solomon says: "Even though City are fielding a far from full strength side I'm still expecting the visitors to extend their lead with a 2-0 win."
Chris Green is predicting more misery for West Ham tonight and writes: "Man City to win 7-2, with Lopes, Navas (2), Negredo, Aguero (2) and Kolarov making it onto the scoresheet."
If you want to have your say on tonight's contest, then drop me a line to firstname.lastname@example.org or via Twitter @skysportsrobp and I'll publish a selection of the best prior to kick-off. Anyone out there think West Ham can do it? Thought not....
City boss Manuel Pellegrini makes eight changes from the side which defeat Cardiff on Saturday, but still has a very strong team available, with Alvaro Negredo and Sergio Aguero up front.
Andy Carroll makes his first start of the season for West Ham after two substitute outings following his foot injury, with Allardyce picking a strong side for tonight's clash.
Man City: Pantilimon, Clichy, Nastasic, Lescott, Boyata, Lopes, Fernandindo, Garcia, Navas, Negredo, Aguero. Subs: Hart, Demichelis, Rodwell, Dzeko, Zabaleta, Jovetic, Kolarov.
West Ham: Jaaskelainen, Rat, Tomkins, Johnson, Taylor, Diarra, Diame, Nolan, J Cole, Morrison, Carroll. Subs: Jarvis, Collison, Adrian, Noble, Downing, C Cole, Chambers
But, where there is life, there is hope, so stick with us throughout the evening and we'll bring you full coverage of the contest, with the match also live on Sky Sports 1HD.
It's pretty much Mission Impossible for West Ham, with Sam Allardyce's side trailing 6-0 from the first leg at the Etihad Stadium two weeks ago.
Good evening and welcome to our live and interactive coverage of tonight's Capital One Cup semi-final second leg between West Ham and Manchester City.