Trevoh Chalobah has agreed a six-year contract extension at Chelsea, which will keep the defender at Stamford Bridge until at least 2028.
The Blues confirmed the club has an option to extend Chalobah's contract for a further year until 2029.
The deal is a reward for Chalobah after the defender forced his way into Graham Potter's side - starting their last seven Premier League matches.
Chalobah also featured in each of Chelsea's four group stage wins in the Champions League, including helping keep consecutive clean sheets against AC Milan.