Gerrard pulled his hamstring and hobbled off in the 84th minute of a 2-1 defeat, a scoreline that flattered England. He later limped away from the stadium and said: 'It's not good.'
England 1 France 2: Capello's boys fail French test at Wembley Despair: England captain Steven Gerrard cannot hide his feeling as he limps off the Wembley pitch
It sparked an instant angry response from Roy Hodgson's coaching department. On his Twitter page, Liverpool's head of fitness and conditioning, Darren Burgess, wrote: 'Unbelievable from all associated with England and English FA with regards to SG's injury. Completely ignored agreement and past history. Completely amateurish and now we pay for their incompetence. Absolutely disgraceful.'
Capello said Gerrard stayed on because slight injuries had forced Rio Ferdinand and Gareth Barry to come off at half-time, and the manager needed the vice-captain to stay on the pitch.
'We spoke with Steve and said he would play one hour but, after Barry's injury we had problems,' said Capello. 'That was the reason he stayed on the pitch. If it's possible, the players will play the time we agreed with the club. But Barry was injured so we needed someone senior on the pitch.
'We are upset about what happened to Steve, of course. He has a problem and we will have to wait for the scan.
'They asked that he play one hour ifit's possible but they can't decide how long a player plays with thenational team. If it's possible, he would have played an hour. Iunderstand why they're upset, and I'm also upset.'
By midnight, Burgess had deleted his tweets, although it was unclear if that was done after an edict from Liverpool.
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Earlier Capello's assistant Franco Baldini had felt obliged to phone Newcastle manager Chris Hughton and explain why Andy Carroll was starting against the wishes of his club, who were worried he might aggravate a groin injury.
Capello said: 'We checked him before the game. He told me he was fit.
'No player has ever played with me who was not fit. Our doctor said he was fit, so the player was ready to play.
'I was really happy with Andy. He played very well. He understood that he'll be a player who'll be important for the future of England. When he received the ball he played quickly, and his movement was dangerous.'
Carroll went off after 72 minutes with England already two down. Peter Crouch grabbed a late consolation, his 22nd goal in 42 England games.
It was Capello's first Wembley defeat after last month's goalless draw against Montenegro.
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Explore more:People: Chris Hughton, Peter Crouch, Fabio Capello, Andy Carroll, Rio Ferdinand, Roy Hodgson, Gareth Barry, Steven Gerrard Places: Newcastle, Liverpool, Montenegro, France, United Kingdom