Hayden Coulson has signed a new contract, committing his future to the Boro until 2025 with the option of an additional year.
The left-sided player is currently out on loan at Scottish Premiership side Aberdeen, having registered 24 appearances so far this season.
Coulson, 24, was handed his senior debut by Jonathan Woodgate on the opening day of the 2019/20 season and scored his first goal in a 1-1 draw with Blackburn Rovers.
He has represented England at Under-16, U17 and U18 level and was a key part of our U18s double-winning side in 2015.
Coulson will spend the rest of the campaign at Pittodrie before returning to Rockliffe for pre-season.