Napoli coach Walter Mazzarri is concerned after seeing Champions League opponents Chelsea part ways with manager Andre Villas-Boas.

The Azzurri will go to Chelsea next week defending a 3-1 first-leg lead.

Mazzarri said: "As a colleague, I'm sorry to hear that. I don't know if this can be an advantage in Champions League terms, as at least we knew how Villas-Boas played. Now we'll see."