If Juventus underestimate Napoli it means Juventus is trying to commit suicide in that match later. But what is certain is that neither Juventus nor Napoli will underestimate each other so that both team must have great motivation to play with their best performance.
Yes, you are right. Napoli have the ability to beat any strong team. Although they are out of form now, they have scored six more goals than Juventus this season. From this it is easy to understand that their forwards are not weak. However, Napoli have conceded the fewest goals in Serie A. Their defense is much stronger.
This is their first game in early January for both teams, so anything is still possible even if Napoli were not at their best before. Getting back to top form is a desire, so players need to be motivated to do so throughout the match.
Napoli are not in form, they have to return to form. And Juventus is in good form now. So it is difficult to predict the result of this match. Anything can happen in this match. But I want to see at least 3-4 goals from this match.