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:
9. Bobby Duncan (Liverpool - loan)
The young striker has been prolific in the Reds' academy set-up and could now be set for a loan move to further his development. He wouldn't be a proven option, but a calculated gamble may be worthwhile. Photo: Nick Taylor/Liverpool FC
10. Jon Taylor (Free Agent)
The wideman is eyeing a move to the Championship despite rumoured interest from the Black Cats, but a deal could yet happen as the window drags on. Photo: Nigel Roddis
11. Harry Brockbank (Free Agent)
The versatile defender is in high-demand following his exit from Bolton Wanderers and would provide some much-needed cover for the Black Cats. Photo: Marie Caley
12. Daryl Murphy (Nottingham Forest)
Transfer-listed by Nottingham Forest, the experienced striker looks set for a summer move. Could a Stadium of Light switch be on the cards? Photo: ADRIAN DENNIS