Collier was a major signing for Gordon Milne in the summer of 1979 – he was the first British player to move clubs through the freedom of contract and cost £325,000. The big centre-half was expected to take over from Jim Holton but after a disastrous defeat at Stoke on his debut Collier was dropped in favour of Gary Gillespie and played only one more game (a 0-4 defeat at Liverpool). His move followed a long career as a dependable stopper at Ashton Gate which ended with a fall-out with manager Alan Dicks. Seven months after arriving at Coventry the club somehow made a profit on him as he moved to US club Portland Timbers for £365,000. In two seasons Collier played over 80 games for the Timbers before joining San Diego Sockers. He has remained in the United States and was coach of San Diego Surf for 14 years.