[3] In round 8 of the 2023 Super League season, Thewlis scored two tries for Warrington in their 20-14 victory over Catalans.
[5] In October 2023 Thewlis was called up to the full England squad ahead of the third test in the series against Tonga.
[6] On 17 March 2024, Thewlis scored a hat-trick in Warrington's 58-4 victory over the hapless London side.
[7] On 8 June 2024, Thewlis played in Warrington's 2024 Challenge Cup final defeat against Wigan.
[8] Thewlis played a total of 22 games for Warrington in the 2024 Super League season as the club reached the semi-final before losing to Hull Kingston Rovers.