Thomas had a long career at Norwood, beginning in 1979 and ending in 1993 after he played his 249th league game, as well as 55 pre-season/night series matches.
He played in their 1982 Grand Final victory over Glenelg, and also starred in their 1984 premiership team where he was awarded the Jack Oatey Medal.
His time with Norwood was separated by a two-year stint at Fitzroy, where he made a total of 28 VFL appearances.
Keith Thomas was appointed the CEO of the Port Adelaide Football Club in 2011, and served in the role until 31 October 2020.
[2] An interchange bench member of Norwood's official 'Team of the Century', Thomas remained involved in the club after his playing career ended and has served on their committee and as a Director.