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
The Welshman will also be pleased that defenders Micah Richards and Nedum Onuoha came through the match unscathed.
Three confirmed absentees through injury are Everton defender Joleon Lescott, Manchester City's Micah Richards and West Ham's Matthew Upson.
But it was City that started the strongest, with Micah Richards, playing at right-back, linking up dangerously with Shaun Wright-Phillips.
Bent hit a low spot-kick past Joe Hart four minutes into added time after he was held back by Micah Richards.
From the resulting corner, Micah Richards' header was cleared off the line.
Forest took the lead when a defensive error by Micah Richards allowed Nathan Tyson to unleash an unstoppable dipping volley from 20 yards.
There was little immediate danger when Micah Richards squared the ball across the penalty area to Ben-Haim despite Hull's forwards closing down the space quickly.
Micah Richards settled a nervy confrontation against Championship side Reading when he rose to power David Silva's corner past Alex McCarthy with 16 minutes remaining.
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He and Weiss are not the first City players to be diagnosed with swine flu, defender Micah Richards having contracted the virus on holiday in July.
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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.
In recent years, City's academy has produced a number of players who have gone on to represent the first team including Shaun Wright-Phillips, Micah Richards and Michael Johnson.
Michael Owen met Micah Richards' punt forward with a prodigious leap, and Rooney was lurking to chest down and lash a brilliant volley high past Russia keeper Vladimir Gabulov.
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.
He broke a 48-hour curfew to visit a curry restaurant in December 2011 before a game against Chelsea, which was quickly followed by a training-ground bust-up with teammate Micah Richards.
Within 10 days of Mancini taking over from Hughes in December 2009, Joleon Lescott, Sylvinho, Roque Santa Cruz, Stephen Ireland, Shaun Wright-Phillips, Micah Richards and Nigel De Jong all picked up injuries.
City slowly began to gather themselves but were given another scare when Micah Richards was outpaced by Tevez only for fellow centre-back Richard Dunne to retrieve the situation by blocking the United striker's shot.
Prior to that, Martin Petrov and Elano, with two low shots, were the only City players who really tested Heinze, in a match that saw Micah Richards recover from concussion to play in central midfield.
In the summer, Manchester City defender Micah Richards was found to be suffering from swine flu and in September, the Swedish Football Association recommended players avoid shaking hands after one team was sidelined by the virus.
Manchester City boss Stuart Pearce, without Joey Barton, Micah Richards and Michael Ball, makes two changes to the side that lost to rivals United last time out, Stephen Jordan and Sun Jihai coming into the team.
Some unfamiliar names are also listed such as Chris Nathaniel, a young agent who has negotiated a seven-figure book deal for England's John Terry and works closely with Ferdinand, Micah Richards, Obafemi Martins and Ryan Babel.
City's defence was already weakened by the absence of Joleon Lescott and Wayne Bridge, and it was further diminished by the loss of Micah Richards, due to an ankle injury sustained in the build-up to Mensah's goal.
Capello's squad announcement on Saturday included a call for Manchester City full-back Micah Richards, a player who had not featured in any of the Italian's previous squads while Arsenal duo Jack Wilshere and Kieran Gibbs were also named.
Micah Richards thought he had made it 2-0 but his effort was ruled out for offside, while Brown had the ball in the City net but it was chalked off for handball as he charged down a clearance.
Adebayor made up for that misfortune eight minutes before halftime when he fired home at the second attempt when the ball fell to him after Shaun Wright-Phillips' shot hit teammate Micah Richards, leaving Chelsea to appeal in vain for handball.
It was perhaps some comfort for Micah Richards, who had to be stretchered off moments before the goal with a head injury and was later taken to hospital with concussion after clattering into his team-mate Nigel de Jong when trying to clear the ball.
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