In 1949 four players left the Newbridge club to play professional rugby league football in the 1949–50 Northern Rugby Football League season: Harris and Bill Hopkins[5][6] to Hull F.C., Granville James to Hunslet and Glyn Meredith to Wakefield Trinity.

Harris was selected to play for Great Britain in the inaugural Rugby League World Cup, the 1954 tournament.

's 13-30 defeat by Wigan in the 1959 Challenge Cup Final during the 1958–59 season at Wembley Stadium, London on Saturday 9 May 1959, in front of a crowd of 79,811,[8] and played hooker, and was man of the match winning the Lance Todd Trophy in the 5-38 defeat by Wakefield Trinity in the 1959–60 Challenge Cup Final during the 1959–60 season at Wembley Stadium, London on Saturday 14 May 1960, in front of a crowd of 79,773.

[9] During the 1959–60 season the Australian national team toured Europe, and Harris was selected play for Great Britain against them.

's 14-15 defeat by Featherstone Rovers in the 1959 Yorkshire Cup Final during at Headingley, Leeds on Saturday 31 October 1959, in front of a crowd of 23,983.