|Date of birth||24 December 1965|
|Place of birth||Larkhall, Scotland|
|Playing position||Defender (retired)|
|2000–20??||Glenafton Athletic (player-manager)|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
McStay played for nine clubs in a sixteen-year professional career before moving into junior football with Glenafton Athletic in 2000. He went on to become assistant manager to Peter Hetherston at Albion Rovers, one of his former clubs.
He had an on-field altercation with Duncan Ferguson during a Scottish Premier Division encounter between Rangers and Raith Rovers at Ibrox Stadium on 16 April 1994. Ferguson, of Rangers, headbutted McStay, of the visiting Raith, in the south-west corner of the Ibrox pitch. Referee Kenny Clark and his linesmen missed the incident, hence Ferguson avoided a dismissal, but he was subsequently charged with assault and, as it was his fourth such conviction, he served three months in prison.
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