O'Shea first played hurling at juvenile and underage levels with the Salthill-Knocknacarra club, before eventually progressing to the adult level. He enjoyed his first success in 2021 when Salthill claimed the Galway JHC title.[1] O'Shea later claimed a Conancht JCHC title after a defeat of Easkey in the final.[2] He has also lined out with University College Dublin in the Fitzgibbon Cup.[3]