De Zerbi says the young attacker has a big future ahead.
He stated: "He has been unlucky this season, he has to stay focussed and start next pre-season at his best.
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"He has to accept this moment playing with team-mates and not alone on the pitch.
"I understand because he is younger and he didn't play so many games he has motivation that is higher then a normal player.
"His attitude can be to play alone and to shoot when he could make assistance.
"He has a big character and the right character to be big player."