Career
Mastalli is a youth exponent from Milan. He made his Serie A debut at 24 May 2015 against Torino F.C. At the start of the 2015-2016 season, he moved to Swiss club Lugano on a one-year loan deal, but he moved back to Milan in January 2016.
Mastalli is a youth exponent from Milan. He made his Serie A debut at 24 May 2015 against Torino F.C. At the start of the 2015-2016 season, he moved to Swiss club Lugano on a one-year loan deal, but he moved back to Milan in January 2016.