The Italian goalkeeper signed a new two-year deal at the Stadium of Light on Tuesday.
The Italian has put pen to paper on a new two-year deal at the Stadium of Light after regaining his number one spot at the club midway through last season.
The former Arsenal man began the campaign behind Costel Pantilimon in the pecking order, but the Romanian's departure to Watford in the January transfer window saw Mannone handed the opportunity to prove himself again.
The 28-year-old did just that, turning in some impressive performances and playing a huge role in the club's late-season surge to safety which saw them lose just one of their last 11 games, conceding just 11 goals in that run.
Mannone has been rewarded for his impressive form with fresh terms at the Wearside club, and he admitted his delight at being given the chance to extend his stay.
He told the club's website: "I just got back so what a way to start the new season. It’s a massive boost for me and my family because we love it here – the club the fans and everyone involved – and it means a great deal to me.
"I fought so hard in the past to get here. There were ups and downs so it is a great achievement for me to sign this contract, and hopefully we’re looking forward to a great season ahead of us.
"We have a great base, the squad is strong and hopefully there will be a few players coming in to help us, and the coaching staff are also great so we just want to get going and get ready."
Mannone will be hoping to start the new season as Sam Allardyce's first pick in goal, and he would certainly appear to have done enough to warrant that status.
It would still be no real surprise to see the Black Cats sign a new stopper, however, with Jordan Pickford currently Mannone's only competition for the number one spot.