The 27-year-old midfielder has agreed a new five-year deal with the Black Cats and Dick Advocaat says he is a very important member part of the club.
Sunderland has announced midfielder Lee Cattermole will remain with the club until 2021 after signing a new and improved deal.
The 27-year-old midfielder, who originally joined from Wigan in 2009, has penned a five-year extension to his previous contract.
#SAFC are delighted to announce that Lee Cattermole has signed a new contract to remain with the club until 2021. pic.