Napoli legend Gianfranco Zola is convinced his old club are Scudetto challengers this season.

The Watford boss says Napoli are Juventus' biggest threat to their title defence.

"Napoli can be Juventus' main rivals for the Scudetto, because Milan did not reinforce and Inter don't seem superior to their status last season. There could be room for teams like Napoli and Roma," he told Il Mattino newspaper.