The France midfielder's current deal runs to 2022.
And he told Sky Sports: "I am happy! Of course, I'm happy. I am happy.
"We are there, we are close (to win trophies). We are still competing in the Europa League, we still have something to play for in the Premier League until City have the trophy in their hands.
"We must continue to work. We have to keep playing, that's it.
"We still have a chance to win something this year, so why not?"