 He also played left-wing in the 18-8 victory over Batley in the 1952 Yorkshire Cup Final at Headingley on Saturday 15 November 1952, scoring 3 tries.He also played in Huddersfield's 2-20 defeat by Wigan in the 1949–50 Championship Final at Maine Road, Manchester on Saturday 13 May 1950.

Cooper played on the wing and scored two tries in Huddersfield's 15-10 victory over St. Helens in the 1953 Challenge Cup Final during the 1952–53 season at Wembley Stadium, London on Saturday 25 April 1953, in front of a crowd of 89,588.Following a leg injury to Pat Devery during the match, Cooper moved to centre and took over the kicking duties.