Napoli are a strong team who haven't suffered a defeat yet in this league, but that doesn't mean they are invincible, Inter are very solid and have a strong enough attack, it will certainly be a very tough match for Inter winning remains the only option to be able to get back in the running for the Scudetto. Milan, Juve, and all the other direct competitors are hoping for a victory for Inter, so as to reopen the championship
Inter still have a chance to beat Napoli in the match on January 5, but Inter must try to do their best and try very hard to try to get a win from Napoli because so far Napoli's defense has been very difficult to break through easily. Maybe Inter will just rely on luck, hoping to be on Inter's side.
If I consider the head to head results as well I think Inter did not really dominate the win when playing against Napoli, because sometimes Napoli can also beat Inter and also end the match with a draw. Meanwhile at that time at least Inter's performance, quality and squad were still better than Napoli but at that time Napoli were able to provide a good resistance when playing against Inter.
Therefore, while Napoli are clearly in their best form at this moment, I personally really believe that Napoli have a greater chance of winning or at least they will get a draw.
Because even though Inter also have great motivation to stop Napoli from going too far, the reality is that Napoli also certainly has big ambitions to become title winners this season.
With the big ambitions that Napoli also have, of course, Napoli will certainly play with great efforts at least so as not to lose playing at the Stadio Giuseppe Meazza. So, it's not only Inter who has great motivation because of course these two teams have the target of getting good results so they will play well in this match.