Napoli coach Walter Mazzarri admits they're in better shape than Champions League opponents Chelsea.

The Partenopei appear to have overcome their crisis ahead of Tuesday's Champions League first leg tie, while Andre Villas-Boas is at the centre of controversy.

"We went through a negative period, but that is something that every team has at times," Mazzarri told Rai Sport.

"We kept conceding at the first opportunity, but now things are changing. Things go better for us, partly because we work on them during the week.

"Perhaps we are in better shape than Chelsea going into this game, but they have champions who are accustomed to playing a certain level of game.

"On Tuesday they know that they cannot make a mistake, so will become unified and I doubt we'll be facing a team in crisis. Naturally, at this level you need a bit of luck too."