Walsh was given a professional contract for the 1986–87 season (during which Ron Atkinson was sacked in favour of Alex Ferguson) and make his first-team debut soon after.
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For a short time in the 1987–88 season, a 19-year-old Walsh was made first-choice goalkeeper after Gary Bailey retired due to injury and Chris Turner was dropped from the team.
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He played in 16 league games before his run in the first team was halted by a head injury sustained in a mid-season friendly in Bermuda, and a succession of further injuries ruled him out until the 1990–91 season.
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The return of Les Sealey (who had been at United for 18 months until the end of the 1990–91 season) in January 1993 meant that Walsh was now third choice goalkeeper, and the following season he was transfer-listed.
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Walsh produced his best form in a number of years in the 1997–98 season and crowned a superb campaign by picking up the club's Player of the Year award.
Gary Cooper | Gary Moore | Gary Allan | Joe Walsh | Gary Gygax | Gary, Indiana | Gary Burton | Gary Lineker | Gary Player | Gary Numan | Gary Hart | Gary Snyder | Gary Cole | Gary Busey | Gary Panter | Gary Oldman | Gary Paulsen | Gary Sinise | Gary Johnson | Gary Hughes | Gary Brooker | Gary | John Walsh | James Walsh | James T. Walsh | Gary Valenciano | Gary Peacock | Gary Owens | Gary Locke | Gary Husband |
Gary Walsh was sold to Middlesbrough just before the start of the 1995–96 season, enabling Pilkington to become United's second choice goalkeeper.