As City prepare to take on bogey team Everton today he believes the French midfielder can do a lot more.
"We are talking about a top, top player here," said Mancini. "And if he wants, he can change every game he plays in. But I think he can do better. He has played some good games for us but he can do better because he has everything.
"I don't think it is fair to say he has struggled. When we talk about Nasri or Yaya or Silva, we think they can change every game just because they are capable of doing it. But sometimes in spells when we are playing a lot of games in a short space of time, a player can be tired. Samir has also had a problem with his calf in the last two games but I wait for him always to play a fantastic game because he can."