Devereux made his Wales début against the 1958 touring Australian team, and the next year played in two games in the 1958 Five Nations Championship under the captaincy of Clem Thomas.
Of the three games Devereux played he was never on the losing side, with Wales winning two of the matches, and drawing one against England.
Devereux played at second-row in Huddersfield's 10-16 defeat by Wakefield Trinity in the 1960 Yorkshire Cup Final during the 1960–61 season at Headingley, Leeds on Saturday 29 October 1960.
He coached rugby union at Mountain Ash Grammar School in the 1970s.
He built a sound reputation as a schoolboy rugby coach, and later became coach of the Welsh Secondary Schools squad, but objections were raised regarding his past associations with rugby league and Devereux relinquished his role.