January 2017 saw Aitor Karanka make three additions to his Boro squad, with Rudy Gestede joining from Aston Villa and Patrick Bamford making his return to the Riverside.
Gestede was the first to sign when he put pen to paper on a three-and-a-half-year deal at the beginning of the month, before Bamford made the permanent switch to Teesside from Chelsea following his previous loan spell in 2014/15.
The third arrival came on deadline day itself when Watford's Algerian international Adlene Guedioura joined for an undisclosed fee.
There were departures aplenty at Rockliffe, with a number of Academy graduates heading off to pursue first team football.
From the first team, Tomas Mejias was the first to leave. The keeper headed to Spanish second division side Rayo Vallecano on loan. He was followed by Julien de Sart who also left on loan to join Derby County.
David Nugent and Emilio Nsue left on a permanent basis, with the duo dropping back down to the Championship with Derby and Birmingham City respectively.
Jordan Rhodes 12-month stay on Teesside is coming to an end after he made an 11th hour switch to Sheffield Wednesday, joining the Owls on an initial loan with the transfer becoming permanent from the summer.
It was also announced that Brad Guzan will make the move back to the United States in the summer, with the keeper set to join MLS newcomers Atlanta United.
Jonathan Burn signed for Bristol Rovers and Bryn Morris joined Shrewsbury, while Mark Kitching and Joe Fryer were loaned to Rochdale and Hartlepool United, and Tom McAloon left Boro after his contract came to an end.
Deadline day saw Austrian Under-19 international Arnel Jakupovic join Italian side Empoli for an undisclosed fee on a permanent basis, while Kitching's loan to Rochdale was made permanent with the youngster signing a two-and-a-half year contract at Spotland.
There were two further loan deals finalised for young players on deadline day with Callum Cooke joining Crewe Alexandra and Harry Chapman returning to Sheffield United after recovering from injury.
Paul Jenkins did add to his Under-23s squad with the signing of 18-year-old Mikael Soisalo. The highly-rated Finn made his debut against Fulham in the PL2.