The Roma fullback is facing months out after breaking down in Italy's Euro 2020 quarterfinal victory over Belgium.
"He didn't deserve that, he has been one of the best players of this tournament and he will still be even if he can't play in the next games," Italy manager Mancini.
"We are very, very sad with what has happened it seems quite a serious one."
Italy teammate Lorenzo Insigne also stated: "Its a great loss, we will try to go all the way above all for him. Up to today he has been such a key player, an influential player for us."
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