Chelsea defender Kalidou Koulibaly has admitted he has not been at his best since moving to the club in the summer.

Koulibaly stated this ahead of Chelsea’s Champions League tie with Real Madrid on Wednesday.

Speaking with the Times, the former Napoli star said, “I know I’m not at 100% yet, but I think I’m coming to my level.

“Chelsea made a big decision to sign me [last summer for £33 million], and there is a big desire in me to give back.

“I want to be part of this club for many years. This is not the year Chelsea was expecting, but sometimes when you have big changes, new proprietors, and half the team is new, everybody has to adapt. But we know how big the ambition is here, and we are going to work to win back the confidence of the supporters.”