Former Chelsea boss Carlo Ancelotti feels Napoli can dump his old club out of the Champions League. The two teams were paired in the round of 16 draw on Friday.
Ancelotti said: "Italian football has made steps forward and the English game is not in great shape, what with Manchester City and Manchester United's elimination.
"Of course, it requires a great performance, but Walter Mazzarri's team can improve a lot from now to February. Chelsea try to make possession their main strength, while Napoli are very dangerous when they win the ball back and go on the counter.
"If that's the situation, then Chelsea have to be very wary of the pace shown by Marek Hamsik, Ezequiel Lavezzi, Edinson Cavani, Christian Maggio and the rest. They are absolutely deadly on the counter-attack.
"After a difficult period, Chelsea seem to be back in shape. It all depends on what physical condition the teams are in when the games come round. The only advantage Chelsea might have is their international experience, but I believe Napoli's enthusiasm and grit can bridge that gap.""Napoli already achieved something remarkable by beating a City side that is dominating the Premier League, so I don't see why they can't repeat it.