The Black Cats will be looking to strengthen their squad by making new signings in the coming weeks, yet there could also be departures at the Stadium of Light.
Ellis Simms has already been recalled from his loan spell by Everton, leaving Sunderland short of options up front.
Some players are also attracting interest from other clubs, while some fringe players may be allowed to leave on loan.
We’ve taken a closer look at every Sunderland player's situation:
17. Patrick Roberts
While he hasn’t always been a regular starter in recent weeks, Roberts remains a key part of Mowbray’s squad and appears to be enjoying his football again after his unsuccessful loan spell in France. Photo: Martin Swinney
18. Abdoullah Ba
A couple of weeks ago the 19-year-old may have been considered a player on the fringes of the squad, yet his performances in recent weeks mean he is likely to stay on Wearside to compete for a regular starting place - rather than leave on loan. Photo: Frank Reid
19. Jack Clarke
Signing the 21-year-old on a four-year deal from Tottenham in the summer looks like an excellent piece of business. After the big money move to Spurs didn’t work out, Sunderland has been the right place to get his career back on track. Photo: Martin Swinney
20. Alex Pritchard
It’s no surprise that several Championship clubs are reportedly monitoring the 29-year-old’s situation when he has less than a year left on his Sunderland contract. Norwich and Stoke are among the teams credited with interest, while Pritchard is currently recovering from a calf issue. Photo: Frank Reid