Balotelli is currently serving a three-match ban for confronting match officials.
Capello said: "I don't know if he will ever mature. I hope so. The greatest talent I ever worked with was Ronaldo, although he was already towards the end of his career at Madrid.
"Fortunately, I have worked with many great players, for example Franco Baresi, Paolo Maldini, Marco Van Basten, Ruud Gullit, Raul and Predrag Mijatovic."
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