[1] As a youth player, Shenton played for Tonna RFC and was part of the Ospreys Academy.
He also captained Cardiff Met in the BUCS Super Rugby competition.
Shenton also played for Llanelli RFC, serving as captain on numerous occasions.
[4] Shenton made his first appearance in a preseason friendly against Bristol Bears.
He made his competitive debut for the Scarlets in Round 7 of the 2022–23 United Rugby Championship against Leinster.