Duffy began his professional career with Dundee United at the age of 17 after passing a first team trial whilst on holiday in 1985.

He returned to Dundee United during the 1989-90 season but left for Falkirk without making a first team appearance.

[3] In August, Duffy rejoined Dundee United for a £200,000 transfer fee,[4] finally making his first team debut in his third spell at the club.

Like his previous two clubs, Duffy gave three years of service before moving on, this time to Ayr United.

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