Fahy first came to prominence in the various juvenile and underage grades with the Ardrahan club. He first appeared on the inter-county scene as goalkeeper with the Galway minor team that won the 2017 All-Ireland Championship before ending the season as goalkeeper on the Team of the Year.[1][2] Fahy subsequently played for two years with the Galway under-20 team before making his senior debut during the 2020 Walsh Cup.[3]