At club level he plays with Corofin and at inter-county level with the Clare senior hurling team with whom he won an All-Ireland Senior Hurling medal after extra time one point victory vs Cork on 21 July 2024, final score 3.29 to 1.34.
[5] Leen first appeared on the inter-county scene with Clare as a member of the minor team beaten by Limerick in the 2019 Munster MHC final.
Leen made his senior team debut during Clare's National Hurling League-winning campaign in 2024.
[7] On 21 July 2024 he started and won his first Senior All-Ireland Hurling medal in an epic 3.29 to 1.34 aet victory vs Cork.
His father, Edward, is a former Kerry hurler and his mother Barbara comes from Clare / Connemara.