Wigan boss Roberto Martinez had first-hand experience of dealing with a wantaway player when Charles N'Zogbia wanted out.
N'Zogbia was on the verge of leaving for Birmingham in the summer of 2010 only for the deal to collapse at the last minute.
The Frenchman eventually left 12 months later, but Martinez stressed he had no problems with the winger's attitude in the intervening period.
"You need to remember football is a team game," said Martinez.
"As an individual your success relies on how much you can work and help the team - you will never see an individual benefiting from selfish conduct.
"When you have an individual having a very selfish act you lose the respect of the players more than anything.
"It is very difficult for you to earn that back and that is the biggest problem Carlos is going to have at Manchester City.
"I am sure Manchester City will deal with that situation in a different way to how other clubs would do because money is not an issue and they can make a decision on the football side.
"But I never saw that behaviour in our dressing room."
Martinez added: "We provoke it and we need to take responsibility for it because we created the transfer window.
"It gives players a specific time to make decisions about their futures.
"The windows bring great excitement for the fans and outside the club but it brings controversy and a contrast of emotions when you have got important games to play for your club and at the same time you are forced to decide the next step of your career.
"That can bring difficult situations but we have never been in a situation where a player never wanted to help the team achieve a result and that is completely different."