Everton's Abdoulaye Doucoure, right, and Southampton's Welington battle for the ball during the English Premier League soccer match between Everton and Southampton at Goodison Park, Liverpool, England. AP
Doucoure joined Everton from Watford in 2020 and played a key role in their successful battles to avoid relegation in recent years.
The 32-year-old hit the winner when Everton beat Bournemouth 1-0 at Goodison Park to stay up on the final day of the 2022-23 season.
Speaking in a video posted on social media, Doucoure said: "Everton means a lot for me. Obviously the past five years it's been hard but I will always remember my time as a dream for me.
"I'm sad to leave the club but I think the time has come for a new chapter for me and for the club as well. I will always be grateful for what the club did for me.
"My best memory, I will say it will be the goal I scored against Bournemouth to keep the club in the Premier League. It was a wonderful moment for me and for the club as well."
Doucoure, who is out of contract in June, was part of David Moyes' team on Sunday when they beat Southampton 2-0 in their final match at Goodison Park.
Everton are relocating to their new arena at Bramley-Moore Dock from next season.
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