Thomas began his career with National League club Cheltenham Town, making his only first team appearance against Chelmsford City in the FA Trophy.
[8] He was first named in a first team matchday squad on 31 October 2017 against Leeds United,[9] and made his league debut on 21 November 2017, coming on as an 89th-minute substitute for Tom Lawrence in a 2–0 win over Queens Park Rangers.
[16] On 8 April 2021, Thomas announced on social media that he had cut his loan move with Ipswich short for personal reasons and he returned to Barnsley.
[19] On 23 November 2021, Thomas came off the bench in a 1–1 draw against nine-men Salford City, missing a great chance to put Rovers two ahead before the home side eventually equalised.
He impressed from this new role, considered as one of his side's best players over the busy Christmas period, notably scoring a last-minute winner against leaders Portsmouth on Boxing Day.
[33][34] During his second season back at the club permanently, Thomas once again found himself out of favour with manager Matt Taylor, struggling for minutes ahead of summer signing Shaq Forde.
[35] Thomas made his youth international debut on 6 September 2019 with England U20, coming on as an 80th minute substitute for Luke Bolton in a 0–0 draw against Netherlands U20 at New Meadow.