He is on the books of Mantova and wears shirt number 27. His main role on the pitch is Defender. He measures 175cm in height and weighs 75kg. His estimated market valuation currently stands at 1000K €.

His latest transfer saw him join Mantova from Catania FC via Transfer on 2025-07-01.

Across the Italian Serie B 2025-2026, Alessio Castellini appeared in 28 matches and averaged 2 tackles, 0.9 interceptions, 2.9 clearances, and 0.3 blocked shots per game.