Juventus legend Fabio Cannavaro says his old club could be vulnerable against Napoli on Friday.

The top two go head-to-head in a Scudetto showdown at the Stadio San Paolo.

"I expect a tough game, because Juve never give in and they'll make it very difficult," Cannavaro told Radio Kiss Kiss.

"Napoli must prove they have grown, that they can play these games and send important signals. They are coming off some not great performances and people expect a lot.

"There is everything they need to do well in this match, because facing Juventus really boosts your motivation."