Thomas began his career with Heart of Midlothian, and represented the Scotland national under-21 football team.
Eventually, he was loaned to Stirling Albion in 1998 and then sold to Greenock Morton later that year.
However, following a cocaine arrest in December 2000, Thomas was sacked by St Johnstone, along with team-mate George O'Boyle.
[2] After recovering from a knee injury, Thomas signed short term deals with lower league clubs Montrose and Berwick Rangers during the 2001–02 season.
After leaving Berwick, he played for Edinburgh Athletic in the East of Scotland Football League and worked for an hotel booking agency run by his mother.