The new deal will keep the goalkeeper at Anfield until 2021.
Mignolet told the club’s official website: “I’m very pleased that I can be at Anfield and a part of Liverpool for a long future. I’m happy to commit my future to LFC.
“I know signing a new contract comes with new responsibility. I’m getting older as well and coming into the years where people would say those are the years a keeper is at his best.
“I know with a long-term contract, you get more responsibility – and I want to take up that role, because I’m the sort of character that wants to be a leader, wants to speak in the dressing room and wants to help the defence.
“I’ll try to work hard together with the goalkeeping coach and staff here, who are behind me and have given their confidence with a new contract.
“I would like to thank them for that but you can’t really do that with words, you have to do that with performances on the pitch and that’s what I’ll try to show.”
Mignolet recorded more Premier League clean sheets than any other goalkeeper in 2015, but he has come under fire from fans and the media this season.
