 Following his amateur career, Fieldgate was recruited by CFL legend and first head coach of the BC Lions Annis Stukus, to join the BC Lions for their inaugural, 1954 season.Fieldgate played tight end, defensive end, linebacker, and defensive back for the Lions over his 14-year career, but achieved the most success as a linebacker.Fieldgate was one of only two "original" Lions with the club when the Lions won their first Grey Cup Championship in 1964 (the other was Fieldgate's teammate By Bailey).