Fearless under a high ball when under pressure, Josh made his debut at full-back while only 17 for the Wolves against the Catalans Dragons in June 2019, the second youngest player in the Super Leaguer era. Two months later he scored his first try against St Helens at The Halliwell Jones Stadium. Thewlis is a versatile outside-back and is widely regarding as one of the most promising youngsters in the competition. He joined the Warrington youth system and his displays have earned him international honours with England youth and academy teams. He recently signed a new long-term contract until 2026.