He is on the books of Cobh Ramblers and wears shirt number 3. His main role on the pitch is Defender.

His latest transfer saw him join University College Cork from Cobh Ramblers via on 2026-01-01.

Across the Ireland First Division 2025, John O'Donovan appeared in 37 matches and averaged 0 tackles, 0 interceptions, 0 clearances, and 0 blocked shots per game.