Like Micah Richards, Stephen Ireland and Michael Johnson, Onuoha is a product of City's successful academy.
BBC: SPORT | Football | My Club | Man City | Onuoha backs Man City youngsters
Tevez turned in Nedum Onuoha's header then, after Cameron Jerome's nodded reply, Adebayor finished a neat move.
The Welshman will also be pleased that defenders Micah Richards and Nedum Onuoha came through the match unscathed.
Nedum Onuoha, Danny Welbeck and Asamoah Gyan were all injured in the Black Cats' 2-0 home defeat by Blackpool.
Martin Cranie's strike, a Nedum Onuoha shot and a Mattias Bjarsmyr own goal put England in control at the break.
But they gained hope when Onuoha slid in on Warrington after briefly losing control of the ball inside Doncaster's area.
BBC: SPORT | Football | League Cup | Doncaster 1-1 Man City (aet)
After the break, Onuoha's fine solo effort made it 4-1 and Adebayor ran clear late on to complete the rout.
Onuoha headed Elano's corner over when he should have found the target and Pablo Zabaleta tested Zaza again from long range.
The Argentine quickly added his second goal when he got the last touch on Onuoha's header from Adam Johnson's deep corner.
Warrington was stretchered off to be replaced by Budtz and shortly after the match finished Salisbury rescinded his decision to dismiss Onuoha.
BBC: SPORT | Football | League Cup | Doncaster 1-1 Man City (aet)
My debut at Arsenal only came about because Nedum Onuoha was injured.
Lescott, replaced by Nedum Onuoha for Wednesday's trip to Tottenham, is likely to miss the next 12 matches including the Carling Cup semi-final.
Milner delivered and inattentive Swedish defending allowed Onuoha to control the ball, and strike a swivelled shot into the corner of the net.
United then survived a melee in the area after Van der Sar misjudged Bellamy's corner, with both Vieira and Onuoha unable to apply the finishing touch.
We voted for the awards at the end of January, our PFA representative at City is Nedum Onuoha and he helps to organise things.
Budtz was brought off the bench after Andy Warrington collided with Nedum Onuoha, a challenge which earned the City player a seemingly harsh red card.
BBC: SPORT | Football | League Cup | Doncaster 1-1 Man City (aet)
But, Kenwyne Jones aside, they were unable to find a way through a makeshift City back-line that was missing Micah Richards and Nedum Onuoha through injury.
Seven minutes later Onuoha fouled Toivonen 22 yards out and the Swedish midfielder picked himself up and fired the resulting free-kick past Joe Hart to make it 3-2.
"I'd say so, because someone from Italy has got a different sort of mentality to the way they go about their training to someone from Spain, " Onuoha explaied.
BBC: SPORT | Football | My Club | Man City | Onuoha backs Man City youngsters
Blackpool boss Ian Holloway was incensed that Titus Bramble - an early replacement for the injured Nedum Onuoha - was only shown a yellow card for a late challenge.
Andreas Johansson had a ferocious shot blocked by Micah Richards with City's defence stretched, before Given saved smartly with his legs after Caca cut inside Nedum Onuoha and let fly.
The duo were making their comebacks from injuries, with Richards absent from the City line-up since February because of a knee injury and Onuoha missing since April with a shoulder problem.
Onuoha found the net as England Under-21 got their Euro 2009 qualifying campaign off to a winning start against Montenegro on Friday under the guidance of former City boss Stuart Pearce.
BBC: SPORT | Football | My Club | Man City | Onuoha backs Man City youngsters
But any chance of a wobble by Manchester City was ended when Onuoha was allowed to stride unchallenged into the area and roll the ball into the bottom corner of the net.
And they should have gone into the break 2-1 up, with Nedum Onuoha heading over from six yards and Cristian Riveros failing to make a decent connection with Elmohamady's lovely delivery from the right.
Sunderland manager Steve Bruce has decided to allow Kilgallon to join the Championship club after signing defenders Nedum Onuoha and Titus Bramble while John Mensah has returned to the Stadium of Light on loan from Lyon.
Onuoha's only start for his club in three appearances this season came in the Carling Cup win over Bristol City but he is pleased to see the club doing well and is confident his chance will come.
BBC: SPORT | Football | My Club | Man City | Onuoha backs Man City youngsters
If Bjarsmyr's absence was to blame for the second goal, England's third owed entirely to his presence as, in attempting to clear, his swinging left foot diverted an Onuoha header from Lee Cattermole's right-wing cross into his own net.
City lost England defenders Richards and Bridge to injury -- the latter stretchered off after a studs-first lunge by Juliano Bennetti -- before substitute fullback Nedum Onuoha gave Chelsea the chance to level in the 82nd minute when he brought down Ivory Coast striker Didier Drogba.
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