So could any of these players interest the Black Cats?
We take a look at every player released by all the clubs confirmed to be in League One for the 2020/21 season. Are they any you would like to see arrive at Sunderland? Scroll down and let us know:
5. Burton Albion
Joe Sbarra, Kwame Thomas, Ethan Vale, Stephen Bywater Photo: Michael Regan
6. Crewe Alexandra
Paul Green, Connor Heath, Nicky Hunt, Aaron Lomas, Shaun Miller, Lewis Reilly Photo: Gareth Copley
7. Doncaster Rovers
Kieran Sadlier, Devante Cole, Alex Baptiste, Alex Kiwomya Photo: George Wood
8. Gillingham
Mark Byrne, Ousseynou Cisse, Ben Pringle Photo: Jack Thomas