The defender began his career with Forest of Dean youth side Mitcheldean before signing for Cheltenham Town’s academy at the age of 11. He cane through the ranks at the Gloucestershire-based club, starting a two-year scholarship as a central midfielder in the summer of 2011 before being converted to a right-back at the age of 17.
He was loaned out to Southern League Division One South & West side Cinderford Town during February 2013 until the end of the season, making 24 appearances as he scored one goal and assisted twice.
Upon returning to Cheltenham, he was released in May 2013 at the end of his scholarship having failed to gain a professional contract.
He quickly returned to Southern League Division One South & West club Cinderford Town in the summer of 2013. He was appointed captain for the 2015/2016 season and was the skipper that lifted the league title at the end of the season as he cemented himself as a fan’s favourite. His individual accolades at The Causeway saw him win the Supporters’ Player of the Year 2013/2014 and the Players’ Player of the Year 2014/2015. After three impressive seasons at the club, he had played 133 games and been an unused substitute twice, scoring 13 goals and getting 27 assists.
His form for Cinderford attracted clubs higher up and he made the move to National League North club Gloucester City in May 2016.
His impressive and consistent form during his first season with the Tigers saw him earn a week’s trial with Championship club Derby County in April 2017 which proved unsuccessful and he returned to Gloucester, being appointed captain for the 2017/2018 season.
He made 80 appearances and was an unused substitute twice across two seasons at Gloucester, scoring two goals and assisting six.
Thomas signed for National League North club Hereford FC in June 2018 and went on to become a hit with the Bulls, finishing second as Supporters’ Player of the Season for 2018/2019 and being named Supporters’ Player of the Season for 2019/2020. He made 71 appearances and was an unused substitute four times, scoring three goals during his time at Edgar Street.
He joined the Seagulls in June 2020, putting in commanding performances in defence during a curtailed season. Ahead of the 2021/2022 season, the right-back was appointed Weston captain following Greg Tindle’s departure. He helped lead the team to the Southern League Premier South Playoffs before a defeat to Hayes & Yeading in the semis.
Keiran was part of the Seagulls side that saw the club win the Southern League Premier South title in 2023 and return to the National League South after four years away.