Craig Bellamy has already clashed with his new Manchester City boss Roberto Mancini.
The Sun says Mancini has caused uproar among City stars by insisting on DOUBLE training sessions and ordering players to stay in a hotel the night before HOME games.
Yesterday he demanded 2½ hours hard graft from the entire squad when he took charge of his first workout.
But the Italian was unaware that, because of a recurring knee problem, Bellamy was only expected to do light training.
And after 90 minutes Bellamy "flipped" saying his knee simply could not take it and told Mancini he had to stop.
Bellamy was allowed to walk out of the session along with skipper Kolo Toure, who complained of a back problem.