Burton-on-Trent, Staffordshire born centre forward George “Tubby” Warren began his football career with Rangemore Albion in 1897 before joining hometown Second Division club Burton Swifts in August 1898, making his Football League debut against Lincoln City in April 1899. He made only two appearances before the end of the season, and in the 1899 close season he transferred to Southern League Sheppey United before joining non league Hinckley Town in 1900. He returned to Football League action with Leicester Fosse, joining them in December 1903, and scoring 7 goals in 21 appearances for The Fossils before the end of the 1903-04 season.
He returned to non league football with Gresley Rovers in 1904, joining Hinckley United in 1905 and playing for Nuneaton Town in 1906 before joining Southern League Coventry City in 1907, scoring 56 goals in 109 appearances for Coventry during his four seasons at Highfield Road. He scored two of City’s goals in the famous 3-1 FA Cup third round win over Nottingham Forest in February 1910. He joined non league Willenhall Swifts in 1911 but returned to Football League action once again, signing with Stockport County in October 1911 and making 3 appearances in late October and early November for The Hatters before joining non league Dudley towards the end of the year. He returned to Nuneaton Town in 1912 and once again to Hinckley United in 1913 before his eventual retirement from the game.
In February 1917, he enlisted as a private in the Army Service Corps and was killed just three months later in the Loos Salient, while serving with the 2nd Battalion, York and Lancaster Regiment. He was buried in Philosophe British Cemetery, Mazingarbe.