At club he played with Killea and Young Irelands, and also lined out at inter-county level with various Tipperary and Dublin teams.
Treacy first played hurling at club level with Killea, with whom he won a Mid Tipperary SHC medal in 1928.
Treacy's adopted team enjoyed a golden age during his playing days and he won Dublin SHC titles in 1932, 1937, 1942 and 1943.
[3] Treacy was immediately promoted to the senior team in 1927 and soon won a National Hurling League title.
Treacy brought his 16-year inter-county career to an end in 1943, by which stage he had won a third Munster SHC medal.