The 30-year-old suffered from a groin problem last term but is looking forward to playing more games under Paolo Di Canio
The 30-year-old managed only six league starts last season for the Black Cats after suffering from a long-term groin problem.
Vaughan believes the worst of his injury concerns are behind him, and is looking forward to playing more games as a result of being able to complete a full pre-season schedule this summer.
The midfielder told the Sunderland Echo: “It was an issue all season really [the groin injury], and probably last season a bit as well.
“Hopefully, though, I’ve turned a corner and it won’t be too much of an issue next season.
“I’ve seen a few different medical people, and the Welsh medical staff have helped me out as well. They’ve given me a programme, as well as the Sunderland staff. So hopefully that will cure the problem.
“It’s not a major issue these days – more something that needs to be managed – because it can cause problems if it’s not looked after properly.
“It’s down to me to work a bit harder in the gym and things like that, but I’m doing that and hopefully I’ll come back for a full pre-season and be able to show the best of myself.
“I think you reach your best form when you’re playing consistently, and that has been something of a struggle for me at times.
“Next season though, fingers crossed, I’ll be injury-free and be able to make more of a contribution.”