And Kristjaan Speakman has outlined Sunderland's belief that Rigg is a "really important part of the club's future".
The history-making midfielder has enjoyed a remarkable few years on Wearside.
After becoming [Sunderland's](https://www.thenorthernecho.co.uk/sport/football/sunderland/) youngest ever outfield debutant and goalscorer in the club's history, Rigg established himself as a major figure in Regis Le Bris' side and featured 45 times in last season's promotion winning campaign.
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Despite the fact he only turned 18 earlier this summer, Rigg has already made 74 appearances for the Black Cats.
"It feels great to sign this new contract," said the youngster, who has been of interest to some of Europe's biggest clubs since his Sunderland breakthrough.
"There was only ever one ambition I had, and that was to agree a long-term deal here.
"It’s been an incredible journey since I made my debut at 15, and I love playing here and being here every day, so I’m absolutely buzzing.
"The past couple of years have flown by – it only feels like yesterday that I made my Championship debut, and a couple of weeks ago I made my Premier League debut.
"It feels unreal, and I couldn’t have asked for more. I’m so thankful to everyone who has helped me, and I’m so proud to be part of this team and this club.”
Speakman said: “We are delighted that Chris has committed his future to Sunderland.
"He was an integral part of our success last season, and we are delighted with the progress he has made from the academy to our senior group.
"His accomplishments to date are impressive for a young player, but Chris, like the club, is looking forward, and we believe he’s a really important part of our future.
"This is another fantastic moment for our academy and our staff, who have developed, progressed, and now retained a top talent, which is key to our strategy and culture.”