Warren played for Glasgow Academicals.[2]
Warren played in the Inter-City match between Glasgow District and Edinburgh District on 7 December 1912. Edinburgh ran out victors with a 13 - 6 scoreline. 3000 spectators braved the rain soaked conditions. Edinburgh led 10 - 3 at half-time and comfortably saw out the second half. Warren had one break for the try-line near the end but was tackled by Edinburgh's Badger just before the line.[3]
Warren also played in the Inter-City match on 6 December 1913. This match ended as a draw; with both teams scoring one drop goal a-piece. Warren made a crucial tackle at the end of the match stopping Edinburgh's Pearson from running through at Glasgow's 22.[4]
Warren was capped for Scotland only the once.[5]
This was the Five Nations match of 28 February 1914 when Scotland played Ireland at Lansdowne Road.[5]
The match turned for Ireland when Scotland failed to capitalise on two chances in quick succession:- the first when John Sweet was tackled into touch when going for the try-line; and the second when Warren knocked on. The Glasgow Herald noted that had Warren passed to John George Will instead, Will would have had a clear run to the line.[6]
Ireland won the match 6 - 0.[7]
