Mou feels the 32-year-old has turned his career around and is finally back to his best.
"He's recovering his self-esteem," Mourinho told the Guardian.
"In the last few years he was not playing a lot, he had problems on the pitch, he had problems outside the pitch, he had suspensions for different reasons, he had injuries, he had managers who didn't trust him enough.
"And it looked like, at a certain moment, his career was going in the wrong direction.
"Even I was questioning, from far away, what was happening to this guy: physical problems, psychological problems, what is going on? I'm happy he's proving he's still a top player."
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