Mino Raiola, hit out at Platini for failing to back Balotelli when he claimed he would walk off during a game if he heard racist abuse.
Platini suggested the forward should be booked if he left the field, but Raiola told the Daily Mail: "I have to say that the reaction of UEFA to what Mario said was very strange and I would have expected a different reaction.
"Mario has had this problem before and in Italy we have a saying: Racism is ignorance.
"Mario is the kind of lad where this kind of abuse glides off his back but I was very disappointed with what Michel Platini said and a lot of people are with me on that. I can't say I'm surprised by the reaction, though.
"I don't believe Platini has done anything to improve the game or help the position of players - as his reaction to Mario shows."