But which former Black Cats stars are now free agents having been released by clubs and which players will see their deals expire soon?
Here, we take you through all of the ex-Sunderland players who have been released or are soon to be released.
Are there any realistic targets that the Black Cats could look to re-sign?
Scroll down to take a look at the list:
9. Billy Jones
After a loan stint with Sunderland's League One rivals Crewe Alexandra this season, former Black Cats full-back Billy Jones has been let go by parent club Rotherham United. Photo: Jordan Mansfield
10. Kazenga LuaLua
Kazenga LuaLua had a short-lived stint at Sunderland during the 2017/2018 season but only made six league appearances before joining Luton Town. However, the former Newcastle United attacker is now out of contract and has departed Kenilworth Road. Photo: David Rogers
11. Danny Simpson
Another former Sunderland loanee, Danny Simpson has just departed Bristol City after making just four appearances in the Championship this campaign. Photo: Harry Trump
12. Connor Wickham
The former Sunderland striker, who has fallen out of favour at Crystal Palace, will see his contract expire during the summer months. Photo: Alex Livesey