Im Man City on my game...sold petrov straight off really, hes good but hes a selfish player and you want your midfielders to be creative with the ball. Robinho you shud try keep at all costs, half the squad think he is a vital part of the team...and he is a quality player.
So sell petrov n replace him, keep Robinho if you can with new contracts or try signing some1 he recommends to keep him happy.