The Italian was speaking after 19-year-old Mark O'Mahony was brought on against Burnley in a 1-1 draw in the Premier League.
After bringing out his latest teen debutant, De Zerbi confessed that O'Mahony deserved a chance to show his talent.
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He said post-game, per The Argus: He has an incredible behavior, an incredible attitude.
When I saw Joao Pedro with cramp, I didn't want to take a risk with him and we have on the bench one goalscorer, one striker."
It is not important how old he is.
The striker was Mark and I gave him the chance to play. He deserved to play."