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Juventus is indeed a good team and has become even better this season so the potential to become champions this season is still very open for Juventus. Meanwhile, Napoli has experienced very different conditions from last season, because this season Napoli were unable to fight better in the Italian League. Even if Napoli try to be better than they are now and target a fairly reasonable place in the League table, I think Napoli can only reach the top five. Even then, it is quite difficult for Napoli to get past several teams whose points are currently almost equal.
Juventus only needs to be consistent if they want to win the Scudetto at the end of the season, their only tough competition is Inter Milan. The other Serie A contestants are not at the same level as them, even Milan, who I hope can revive the race, also failed. Full focus on local competitions must be put to good use when Inter return to their European tour in the Champions League, that's when they have the best opportunity to overtake Inter. Next week will be the start of the competition, Juventus will challenge Inter directly, and we will see who is the best between the two.
Regarding Napoli, I predict they will not be able to finish in the top four of the standings, in fact I feel they will miss other European competitions next season. Overall their performance has never been stable, in the last five matches, Napoli was only able to achieve 1 win, and is currently ranked 9th. There is no longer any hope for Napoli, their performance has dropped slowly, from a top club to a mid table club, that's the fact about them now.
I think Juventus can win the Scudetto this season, but consistency is crucial. Although dismal last season, their performance has improved from what I've seen. Their lack of European competition qualification was a wake-up call. They appear to have recovered this season and are determined to win again in Turin. As Inter Milan's Champions League schedule is tight, they must continue this momentum. This is a great opportunity for Juventus to pass Inter in the league.
I share your Napoli pessimism. Weak form, with only one win in their last five matches. Their chances of finishing in the top four are minimal at 9th. More consistent and promising clubs include Fiorentina, Bologna, Roma, and Atalanta. Napoli fans find it hard to accept that the team is slipping from the top flight to the middle. They'll probably not play in Europe next season unless they improve drastically.