A player in both the midfield and centre-forward positions, he was a member of the Kilkenny team that won the 1967 All-Ireland Championship.
After a brief spell playing junior hurling with Threecastles, he later joined the amalgamated St Lachtain's senior team with whom he won county championship medals in 1961 and 1963.
After a series of successful trials he was added to the Kilkenny senior panel for the 1962 championship before being dropped for the Leinster final.
Teehan was again a panellist for the 1963 championship, winning a Leinster medal on the bench before being dropped for the All-Ireland final.
As a member of the Leinster inter-provincial team in 1967, Teehan won his sole Railway Cup medal.