Grundy qualified as a schoolteacher and played part-time for Wigan Athletic in the Cheshire League, scoring eight goals in 71 appearances for the club between 1963 and 1967.
[1] He went full-time in January 1968 and was part of the Bury side that won promotion from Division Four that season.
Released by Bury at the end of the 1970–71 season, Grundy joined Great Harwood Town in July 1971.
He went on to play for Bangor City and Morecambe before returning to Wigan Athletic for a second spell in September 1977,[5] making a further four appearances for the club.
[4] In May 1978 he moved from Northwich Victoria to Winsford United[6] before being transferred to Mossley for a fee of £100 in March 1979.