Chelsea defender Cesar Azpilicueta is happy with their 3-4-3 system.

The champions have retained the 3-4-3 formation this season and Azpilicueta, who has had to move from left-back to the right side of a three-man defence in the new set-up, says he knew it would work.

"I'm enjoying it a lot," the Spaniard told Chelsea's official website. "For me, it was a new position, a new challenge.

"I had no doubts about it from the very first moment the coach told me he wanted me to play there.

"I thought I was capable of doing it and I'm always trying to improve and take in advice to keep on developing as a player.

"It's important to have that flexibility and be ready for it, because the coach can choose between different systems depending on our opponents. So it's important to have confidence in order to be able to swap systems."

He added: "In a three-man defence you get more in touch with the ball and you participate more when distributing it. The way you attack is different too, because when you play as a full-back you do so in wide areas. You can cross the ball from closer to the box."