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:
9. Ben Gibson
Wanted to leave Burnley after making just one Premier League appearance in two years with the Clarents. The 27-year-old signed for Norwich on loan in the summer, with an option to make the move permanent. Photo: Stephen Pond
10. Jack Stephens
The centre-back made just six appearances for Boro, yet his loan spell on Teesside helped him break into Southampton's first team. The 26-year-old made 28 Premier League appearances last season but has fallen down the pecking order at St Mary's. Photo: Jan Kruger
11. George Friend
Ended his eight-year stay at Boro when he joined Birmingham City in the summer. The defender has made 13 Championship appearances this season. Photo: Nigel Roddis
12. Adam Reach
Left Boro to join Preson on loan at the start of the 2015/16 season and signed for Sheffield Wednesday the following summer. The 27-year-old has been a regular at Hillsborough for the last five seasons. Photo: Getty Images