"Balotelli is unmanageable, he is a kind of poison for the group," Leboeuf told RMC Sport.
"On Wednesday I saw the match against Atletico Madrid in the Champions League and the authority of Seedorf has been damaged.
"He almost did not want to come off after the shoulder injury, the Coach was forced to almost reprimand him.
"I find this attitude very annoying, even for the Italian national team - he has a great talent, but he is difficult to insert into a group."
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