He currently plays for Mantova, wearing the number 27 shirt. He plays primarily as a Defender. He stands at 175cm tall and weighs 75kg. His current market value is estimated at 300K €.

His most recent move was a Loan from Pisa to Catania FC on 2025-06-30.

Throughout the Italian Serie B 2025-2026, Alessio Castellini featured in 28 matches, averaging 2 tackles, 0.9 interceptions, and 2.9 clearances per game, while blocking 0.3 shots per game.