Sonny Finch and Terrell Agyemang have returned to the club following loan moves.
Striker Sonny returns after a spell with MK Dons.
The 19-year-old found his game-time limited with the League Two club and he returns to Boro to continue his development.
The striker clocked up eight appearances since joining MK in August, and made just two starts, both of which came in the EFL Cup.
Under the terms of his loan, Sonny was available to play in our Under-21s and he has featured regularly for Mark Tinkler’s charges since the start of November.
Agyemang is also returning to Teesside after his loan spell with Airdie.
The 22-year-old made 19 appearances for the Scottish Championship side and scored twice.