Tallis first played hurling at juvenile and underage levels with the Lisdowney club, while also playing as a schoolboy with Coláiste Mhuire in Johnstown.
[1] He progressed to adult level with his club and was top scorer when Lisdowney beat Thomastown to win the Kilkenny IHC title in 2020.
[2] Tallis first appeared on the inter-county scene as goalkeeper on the Kilkenny minor hurling team that lost the 2019 All-Ireland minor final to Galway.
[3] He progressed to the under-20 team and was again in goal when Kilkenny beat Limerick in the 2022 All-Ireland under-20 final.
[4] Tallis first played for the senior team during the 2023 Walsh Cup.