But could any of them prove of interest to current manager Phil Parkinson, who is set to lead an overhaul of his squad this summer?
Scroll down and click through the pages to see the former Black Cats available as free agents this summer – and let us know whether there are any you would take back:
1. Danny Simpson
After spending much of last summer in the wilderness, Simpson penned a deal at Huddersfield Town earlier in the season - but will leave the Terriers this summer. Photo: Nathan Stirk
2. Craig Garnder
The former Sunderland midfielder sees his current contract at Birmingham City expire in the summer, but he’s set to take up a coaching role at St Andrew’s next season. Photo: Alex Pantling
3. Jonny Williams
While injury ravaged his time on Wearside, Williams showed some glimpses of real quality during his time at Sunderland. His deal at Charlton is set to expire this summer, and he may have his sights set on bigger things. He has signed a deal to stay with the Addicks until the end of the 2019/20 campaign. Photo: David Rogers
4. Lee Camp
We’re pretty sure nobody will want him back at Sunderland. But nonetheless, his contract at Birmingham City is up at the end of the 2019/20 season. He recently signed an extension to keep him at St Andrew's until the campaign is concluded. Photo: BEN STANSALL