Born in Kilmainhamwood, County Meath, McCormack first played Gaelic football at minor club level.
He was part of the Castletown/Kilmainhamwood team that won the [[Meath Minor Football Championship[|Meath MFC]] title in 1961.
[1] McCormack later played at adult level with a number of clubs, including Gaeil Colmcille, Nobber and Kingscourt Stars, before ending his career with Kilmainhamwood.
[2][3] By the time the junior team won a second Leinster JFC in 1964, Mccormack had been moved to the goalkeeping position.
He played his first game with the senior team in tournament against Dublin in 1965, before becoming first-choice goalkeeper a year later.