Karanka, who is now in charge of Birmingham, provided plenty of great memories for Boro fans during his time at the club – but what has happened to the squad which reached the Premier League under him?
Scroll down and flick through the pages to see the players who made five or more appearances for Boro during the 2015/16 campaign and where they are now:
5. Daniel Ayala
Left Boro at the end of June and eventually joined Blackburn on a free transfer. Has only made seven Championship appearances this season due to injury. Photo: Chris Brunskill
6. Fernando Amorebieta
Has played in Spain and Argentina since his time at Boro. Now playing in the Paraguayan first division for Club Cerro Porteno. Photo: Stu Forster
7. Ritchie De Laet
Signed for Belgiun side Royal Antwerp permanently from Aston Villa last summer after a loan spell at the club. The 32-year-old has played regularly this campaign. Photo: Pete Norton
8. Dael Fry
The only player on this list who is still at Boro. Looks back to his best this season and is still only 23. Photo: Getty Images