Karanka spent around a year in charge and oversaw over 50 games before his departure was confirmed last month. His exit did not come as a major surprise to the Forest fans, but there is no question that he appeared to be a popular figure amongst the supporters.
The incredible atmosphere inside the City Ground for their victory over Leeds at the start of the year sent a clear message to the club hierarchy that the fans wanted Karanka to stay. But his tenure would not last much longer and he has since been replaced by Martin O'Neill.
But Karanka made it clear that he has nothing but positive things to say about his time with Forest when asked about his spell and his departure.
"I think it's been an honour for me to be part of a historic club. I have a lot of good memories. When I arrived I said I wanted a crowd proud of their team and I think we got it. It's been a pleasure," he told Sky Sports.
"It's football. In my life, I want the best for everybody and I think at that time the best for the club was to take that decision."
The pressure was always going to be on Karanka with the club enjoying a very busy summer. Forest made a number of statements in the transfer market, but given how many signings they made, it is probably no surprise that things did not click immediately.
Karanka's supporters will certainly argue that his spell with Middlesbrough proved that he was a manager who could have delivered promotion if given breathing space.