George began playing football in his native Scotland for Forfar Athletic in 1920 before coming to England in 1921 to play for Bradford Park Avenue in Division two. McLean left Forfar just before the Loons joined the Scottish Football League. He was good enough to sign a contract just before his leaving to ensure the Angus side received £700 from Bradford for his services. His club were relegated in his first season but George stayed at Horton Park Avenue becoming one of their legendary players, scoring over a century of league goals and guiding the club to the Division Three North title in 1928. McLean also played in the famous F A cup upsets of Everton in 1923  and Derby County in 1930, scoring the last minute winner in the former. After a decade in Bradford George was signed by First Division Huddersfield Town in 1930. McLean went home to Forfar and made his second debut in 1935, playing until the outbreak of World War II in 1939.
Neilson Kaufman, football historian informed Wikipedia that McLean died in Forfar, Scotland during 1970.