The striker is on-loan at La Dea from AC Milan.
Tedesco said: Yes and no (was I surprised by De Ketelaere's form). No because I know well what Charles is capable of. Yes, because he came from a difficult season, in which he didn't play and never found consistency."
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Tedesco added: San Siro is fantastic, but it can be a challenge for a new player at certain times. Maybe you start well, you find the rhythm and then it's easy.
But if you train for a whole week and then only have some moments to show how much you're worth, it becomes tough. But if you sign for a team of a certain level, you also know what you're up against."