Hammersmith, London born right half George Gates began his senior football career with Southern League club Brentford in 1904-05 and had two seasons with The Bees, scoring 3 goals in 16 appearances for the Griffin Park club. He joined Second Division club Clapton Orient in June 1906, making his Football League debut against Stockport County that September, losing his place in April 1907 after making 26 appearances during his debut season. He was less regular in their 1907-08 campaign, and 1908-09 he was largely used at inside left, where he scored 7 goals playing half of Orient’s matches that season.
Gates joined Second Division club Grimsby Town in the 1909 close season after 56 appearances for Clapton Orient, but had only a single season with The Mariners, scoring twice in 18 appearances before returning to Southern League action with Merthyr Town in the summer of 1910. With Merthyr he won the Southern League Second Division Championship in 1912 and played for them until joining non league Troedyrhiw Stars in 1914. After the First World War Gates played for Welsh non-league club Bargoed in 1919 becoming their player-manager between 1920 and 1921.