Donnelly first played hurling and Gaelic football at club level with Thomastown.
He claimed his first silverware at adult level when Thomastown won the Kilkenny SFC title after a defeat of Mullinavat in 2021.
[1] Donnelly added a Kilkenny IHC medal to his collection in 2023, when he captained the team to the title after a 1-29 to 0-17 defeat of Mooncoin in the final.
[3] Donnelly won a Kilkenny SHC medal in 2024, following a defeat of O'Loughlin Gaels.
[5] Donnelly was added to the senior team for the pre-season Walsh Cup competition in 2022.