The former Manchester United forward has 14 goals in 23 games in his first season in Ligue 1.
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De Zerbi told Get French Football News: "He is lucky to have a very present father. He knows that.
"I talk to his dad once in a while and we really try to help him develop and reach the next level.
The Italian coach is well aware that he is dealing with a star player.
"He has both technical and moral qualities. He's a smart guy. I talk to him a lot so we can always try to make the most of him."