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:
13. Corry Evans
The Sunderland captain is also in the final year of his contract. At 32, Evans has been an important player this season, yet the club are looking to strengthen their holding midfielder options in January. Last season, Sunderland left contract talks until the end of the season as they were fighting to win promotion from League One. Photo: Stu Forster
14. Leon Dajaku
Sunderland never disclosed the length of the 21-year-old’s contract after a clause was triggered for the club to sign him permanently. At the start of the season, the club viewed Dajaku as someone who could provide cover up front so, while a loan move remains a possibility, they will be reluctant to let him leave too soon in the window. Photo: Frank Reid
15. Elliot Embleton
A freak injury suffered in the draw at Hull means the 23-year-old is recovering from an ankle fracture and significant ligament damage. Sunderland are hopeful he will play again this season. Photo: Frank Reid
16. Carl Winchester
There is an option for Sunderland to recall the 29-year-old from his loan spell at Shrewsbury this month, yet it seems unlikely Winchester will return to Wearside. With his Black Cats contract set to expire in the summer, they may want to recoup a fee if an offer comes in from elsewhere. Photo: National World