He currently plays for Cheltenham Town, wearing the number 41 shirt. He plays primarily as a Goalkeeper. His preferred foot is Right.

His most recent move was a Transfer from Cheltenham Town to Worcester City on 2026-08-21.

In the English Football League Two 2025-2026, Mamadou Diallo played 33 matches, averaging 0 interceptions, 0 tackles, and 0 clearances per game.