Real Madrid star Ronaldo talks up Balotelli ability
"I don't know Mario personally but what he does outside of the pitch I don't really care about," he told the Sky Italia.
"For me, he's always seemed like a good player. He's managed to make his mark at Milan and with the Italian national team.
"I'd say, judge him on what he does on the pitch - what happens in private is not really anyone's business.
"My favourite player in Serie A? To be honest, I don't really follow the Italian League."