Ake has been handed a new five-year contract with the Blues, and the Netherlands Under-19 international has insisted that he will continue to work hard to establish himself at Chelsea.
The 18-year-old told the club's official website: "I'm very happy that Chelsea is rewarding me with a new contract for my effort and development over the last years.
"I would like to thank everybody at the club for everything that they did for me. Thanks to them I have come so far. I won't let them down and I will keep on working as hard as I can."
Ake made six appearances for Chelsea last season.