At school, Kiely played hurling at Coláiste Naomh Cormac in Kilcormac.
[2] He also won the Hurler of the Year award during his time with the club's under-21 team.
[7] Kiely first appeared on the inter-county scene for Offaly during a two-year tenure with the minor team.
[9] Kiely made his senior team debut in a National Hurling League game against Laois in 2015.
After returning to the team, Kiely won a Joe McDonagh Cup medal in 2024 after a defeat of Laois in the final.