As a child, Terry Devlin was a supporter of Manchester City FC. Devlin joined Glentoran from Dungannon Swifts on 31 August 2022. Devlin had made his debut for Dungannon Swifts at fifteen years-old.[4] In his one season with Glentoran he became a first team regular and helped the side reach European qualification.[5][6]
In June 2023, Devlin was announced as a signing for EFL Championship side Portsmouth.[7] His commitment to the club was extended in February 2025 when he agreed to a new three-year deal.[8] After five substitute appearances he made his first league start for Portsmouth on 28 October 2023, and scored the winner as Portsmouth came from 2–0 down to defeat Reading 3–2.[9] In January 2024, he suffered a season-ending shoulder injury.[10]
Having played the majority of the season at right-back, he was named as Portsmouth's Player of the Season for the 2025–26 season.[11]
He made his senior debut for Northern Ireland on 20 March 2025, in a 1–1 draw against Switzerland,[16] before making his first start against Sweden on 25 March 2025, in a 5-1 defeat.[17]
Style of play
Portsmouth manager John Mousinho described Devlin as a versatile player who is comfortable in midfield or at right-back[8] and as having the ability to run, compete, and score goals.[18]