Once dubbed as Ryan Giggs' heir, the Belgium international has struggled at the Stadium of Light.
Januzaj has scored just once for the Black Cats despite being reunited with former boss David Moyes.
With Henrikh Mkhitaryan, Anthony Martial, Jesse Lingard and Juan Mata all in Jose Mourinho's squad, his chances of a future at Old Trafford are slim.
The most valuable player for each Premier League team 2016/17
Thu, March 16, 2017
Express Sport brings you the most valuable players from every Premier League club according to Transfermarkt. This list does not include loan players
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Arsenal: Alexis Sanchez – £55.25m
Adnan Januzaj has hinted he could leave Manchester United
Adnan Januzaj was once touted as a potential Manchester United star
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And the 22-year-old has admitted he does not know where he will be next season.
“It has been very difficult because it is not easy to go from Man United to Sunderland," he told the Sunderland Echo.
"I had to just do it, I will learn from it because I am 22.
“People think I am 26 or 27, I am only 22. I know people want more from me.
Adnan Januzaj has struggled under the tutelage of old boss David Moyes
“The other side of it is that they have to look at other parts of my game.
“I have learned a lot here and it will make me stronger.
“I don’t know where I will be. I feel much fitter and I am happy and we will see what happens.”