But which players are still available this summer who could be interesting the Black Cats? We take a look at the best players still available who could realistically arrive at the Stadium of Light in the coming weeks – scroll down and click through the pages to see who could be available as transfer business ramps up:
5. Paul McShane (Free Agent)
The centre back needs no introduction to Sunderland fans, and could prove a solid option in defence as Ross eyes depth in that department.
Photo: Nathan Stirk
6. Ross Wallace (Free Agent)
Another player with Sunderland links, versatile midfielder Wallace is yet to commit to Fleetwood Town and showcased last season how effective he can be in the third tier.
Photo: Harry Murphy
7. Gael Bigrimana (Free Agent)
With experience in England and Scotland, the midfielder would provide some added nous to the Sunderland side. Whether they need another midfielder, though, would have to be questioned.
Photo: Ian MacNicol
8. Josh Bowler (Everton - loan)
Sunderland are crying out for some more creativity out wide, and exciting youngster Bowler would certainly fit the bill. Everton are willing to allow him to secure a loan move this summer.
Photo: Harriet Lander