Mancini admits he's fed-up with the complaints from players of his rotation policy.
"I want a mentality like at Manchester United and Chelsea, where the players understand why the manager has to make changes, but the problem for us is that we can't just change it in five months," Mancini said.
"I played football myself and I understand why the players who are not chosen are unhappy but at the same time it's really important that we start to change their mentality because if we want to win something, to become a top team, it's going to be impossible if every few days a player does an interview saying [putting on a sad voice]: 'Oh, I'm not playing.'
"I understand that only 11 players are happy and the rest are unhappy but we must change because the other top teams have this mentality and now it's time the players here understand that the manager can choose only 11 players and if he leaves someone out it's not because he thinks Manu [Adebayor] or [Mario] Balotelli or Kolo [Touré] are not good players. They can knock on my door and I will always give them an explanation."