The France international joined the Toffees in January for £24m after falling down the pecking order at Manchester United under Jose Mourinho.
And after featuring 14 times in the league for the Merseysiders, the 27-year-old's composure and stability in the defensive midfield role under manager Ronald Koeman was a distinctive highlight during their upturn in form.
A seventh-place finish at the end of the season saw the France international on the losing side only twice - but now the former Southampton player says he's ready to lead Everton into a new and exciting era.
"I want to have a great pre-season, push myself to the limit and push this football club back to the top," he told the club's website.
"I know myself and I know there's more to come from me. I'm happy with my performances but I know I can push myself even more to be the best as possible.
"In all my career, every season I have wanted to improve, wanted to get better than the season before and to be the best I can. I'm 27 now but I’m not going to stop. I just want to improve every day."