Harrington's father is Welsh former footballer Phil Harrington, who was also a goalkeeper.[3]
Club career
Cork City
Harrington began his career at Cobh Ramblers, moving to Cork City in January 2018.[3] In August and September 2022 he was linked with a transfer to English club Everton.[4][5][6] His proposed move to Everton was cancelled due to a shoulder injury, and in December 2022 he instead signed a pre-contract with English club Fleetwood Town.[7] In his final year with the club, he featured 29 times helping them to promotion by winning the 2022 League of Ireland First Division.[8]
Fleetwood Town
In January 2023 he transferred to Fleetwood Town for an undisclosed fee.[9][10][11][12][13] Harrington cited the chance to work with Fleetwood manager Scott Brown as an influence on his decision to sign for the club,[14] and later said that the time either side of the transfer had been "crazy".[15] On 27 April 2024, he made his debut for the club in a 3–0 win over Burton Albion in the final game of the season after recovering from a long term injury that kept him out of action since signing for the club.[16]
Harrington qualified to play for Wales through his father, and in November 2024 he was called up to the Wales senior squad for the first time by manager Craig Bellamy for UEFA Nations League games against Turkey and Iceland.[18]