Chelsea legend Gianfranco Zola has warned his old club of the atmosphere at Napoli's San Paolo.

Chelsea are in Naples tonight for their Champions League encounter.

Zola told the Daily Mail: "This will be an interesting game and result and not one I want to predict. One thing I can tell you is the atmosphere will be hot. It is a special place. Sometimes you enter this stadium and it is boiling. It is an amazing feeling. You feel like you are a lion. It will be like that against Chelsea.

"The passion creates a lot of positive energy for the team. I was there when Maradona returned for the first time (Ciro Ferrara's testimonial in 2005) and it was fantastic.

"You have to understand what Maradona means for the people of Naples. It was one of those things you really love about football."