English defender who joined Sunderland from Wycombe Wanderers in July 2018. Initially signed as a midfielder, adapted to centre-back role and surpassed 300 appearances. Named 2018-19 Young Player of the Year and included in 2020-21 EFL League One Team of the Season. Appointed club captain ahead of 2024-25 season. Helped Sunderland win 2025 Championship play-off final despite dislocating his shoulder during the match.