Balotelli was not even in the stands for the win over Atalanta, as Inter sent him home from the training ground last night.
Muntari said: "I wouldn't know what to say about Mario. He is our teammate, he apologised and is still very young. When you make mistakes, you learn, the fans must understand that.
"Mario is really a good kid and we all care about him. He's such a strong player, it's just that some of his attitudes are not good.
"He is still so young and needs time to mature. If we give him time, he'll become a great player. Will he grow up at Inter? Of course, because he has a contract. I hope he remains."