Gary Cahill has admitted that he has "extra motivation" ahead of Chelsea's second leg Champions League tie against Napoli.

Cameras picked up the 26-year-old mouthing "so bad, so bad" during the 3-1 first-leg defeat in Naples three weeks ago and Cahill is now looking to put things right.

He told The Daily Star: "That was just a reaction. Whenever a goal goes in, I just shout something. Defensively, on the night, I thought we were poor and I was a big part of that.

"Conceding goals is not a nice ­feeling and I felt on the night ­everything went wrong that could have gone wrong.

"I've definitely got a bit of extra ­motivation to turn things round against Napoli."

Chelsea have kept three clean sheets in their last four games and another is vital if they are to progress on Wednesday evening.