Michael Keane has penned a five-year contract at Goodison Park, the 27-year-old now committed to the Toffees until 2025.
Recently recalled to Gareth Southgate's England squad for the opening Three Lions matches of the 2020/21 season, Keane joined Everton from Burnley in the summer of 2017.
"My best years are definitely ahead of me," he told the club website.
"I have loved my three years at Everton and am looking forward to seeing what the future holds. I'm hoping we can kick on this season and make the fans proud again."