Thomason started his youth career at Blackpool as a left-back, where he spent eight years, before joining Longridge Town at the age of 16. After signing with the club in 2018, he converted into a central midfielder, which is where he regularly features now.
On 6 January 2020, Thomason joined Bolton Wanderers, where he played a significant role in the club’s promotion to League One and was subsequently named Bolton’s Young Player of the Year for the 2020-21 season.
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