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:
9. Ipswich Town
Ipswich Town are yet to confirm their retained list. Photo: Stephen Pond
10. Lincoln City
Charlie Andrew, Michael Bostwick, Neal Eardley, Lee Frecklington, Akeem Hinds, Jamie McCombe, Tom Pett, Jason Shackell, Alan Sheehan, Grant Smith, Josh Vickers Photo: Laurence Griffiths
11. MK Dons
Dylan Asonganyi, Ben Gladwin, Ryan Harley, Joe Mason, Stuart Moore, Jordan Moore-Taylor, Charlie Pattison, Ben Reeves, Laurie Walker Photo: Catherine Ivill
12. Peterborough United
Aaron Chapman, Conor O’Malley, Rhys Bennett, Alex Woodyard, Callum Cooke, Marcus Maddison Photo: Jordan Mansfield