Trevoh Chalobah has been rewarded for his impressive form under Graham Potter with a new deal that will keep him at Chelsea until at least 2028.
The 23-year-old has become an important player since Potter took over from Thomas Tuchel in September, featuring in 12 out of the former Brighton and Hove Albion manager's 14 games at the helm.
Chalobah has made 43 appearances in total for the Blues, is now committed to the Blues until at least June 2028, with a club option to extend to 2029.
The defender, who has been with Chelsea since the age of nine, said: "I'm over the moon to sign this contract. It's been an honour every time I put the shirt on. I want to give my all and do anything for this club.
"As everyone knows I've been here from a young age and to continue here is every kid's dream. Whenever I get the chance, I'll give my all for the club and look for the future ahead."
Chelsea chairman Todd Boehly and co-controlling owner Behdad Eghbali said: "We're delighted that Trevoh will be extending his stay with Chelsea.
"He has been with us since childhood and has grown into an exceptional young player.
"He's an important part of our men's first team squad and we're excited to see what's next for Trevoh at Chelsea."