Signing number three is another free, Jordan Willis, 24, a defender who played for Coventry City until the end of last season.
Salut! Sunderland is happy to extend its customary warm welcome to a new recruit who describes himself as enthused by the prospect of playing in front of big crowds.
He arrives on a two-year deal after making more than 200 appearances for Coventry.
SAFC.com quotes him as saying: “I’m buzzing to be signing for a club of this stature. When a club like Sunderland comes in for you, you just want to be part of the journey of getting them back to where they deserve to be.
“You dream of playing in front of big crowds as a kid, so I can’t wait to get started and get out on the pitch.”
The manager, Jack Ross, who has already brought in a goalkeeper, Lee Burge, also ex-Coventy, and another defender, Conor McLaughlin, from Millwall, says Willis was identified as a target a while ago.
“He is going to get better, so I’m delighted that he has agreed to come here and I’m excited about what he will bring to the club, as he has attributes we wanted to add to the squad.”