The 27-year-old defender has committed his future to the Blues until 2020 after signing a new three-and-a-half-year contract.
And Azpilicueta, who joined the club in 2012, admitted the arrival of Antonio Conte helped convince him to put pen to paper.
“I’m really happy to have signed a new contract”
Chelsea defender Cesar Azpilicueta
He told the club’s official website: “I’m really happy to have signed a new contract.
“Since I arrived here my target was to progress as a player and win trophies.
“This new contract gives me the chance to continue my relationship with the club, that’s what I wanted and obviously I’m really happy here.
“We’ve had some really good moments so far this season. From day one, we started working very hard.
“We have a new manager with new ideas and I’m really happy to be working with him.
“Obviously we can still improve but the long-term aim for us is to win trophies, that is what we all want, the players, manager and fans.”
Azpilicueta has played every minute in the Premier League for Chelsea this season.