He currently plays for Cobh Ramblers, wearing the number 3 shirt. He plays primarily as a Defender.

His most recent move was a from Cobh Ramblers to University College Cork on 2026-01-01.

Throughout the Ireland First Division 2025, John O'Donovan featured in 37 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.