Downey began his club career at juvenile and underage levels with the Glen Rovers club on the northside of Cork city.[5] He had success in the under-21 grade in 2023 when the Glen won the Cork Premier 1 U21HC title.[6] Downey won a Seandún U21B FC title with the Glen's sister club St Nick's in 2024.[7]
Downey made his senior team debut at midfield in the Glen's 0–24 to 1–10 defeat by Douglas in September 2021.[8] He ended his debut championship season with a 0–24 to 1–18 defeat by Midleton in the final.[9]
Inter-county career
Downey first appeared on the inter-county scene with Cork as a member of the minor team in 2019, before being named team captain in 2020.[10] His minor career ended without success, however, he immediately progressed to the under-20 team. Success in this grade was immediate with Downey claiming Munster and All-Ireland U20HC medals in 2021 after respective defeats of Limerick and Galway.[11][12] After surrendering their titles the following year, Downey claimed a second Munster U20HC medal after a two-point defeat of Clare in 2023.[13] His last game in the grade saw him claim a second winners' medal after a defeat of Offaly in the 2023 All-Ireland U20 final.[14]