You can start predicting a team that has the possibility of winning the league by the signings the team is making and from the news it is very clear that for now only Napoli is taking some chances to bring in good players so pointing them as the team to possibly win the league next season isn't bad but it doesn't mean that they must end up winning the league. The champions League league will be tough next season seeing the numbers of transfers that has been completed by the top teams, it's going to be fun next season and the competition will stand out well too.
It is still too early because if you look at the previous season who would have thought Inter Milan and PSG would enter the final, but the fact is that they worked hard to be the best until PSG managed to come out as champions. Napoli is one of the Italian representatives who may be much more prepared compared to other teams and if you look at the quality of the senior players they have brought in now it will give them a chance to compete in the Champions League. But this is not enough because the Champions League is known to be quite competitive and sometimes the quality and mentality of the players greatly influences in facing certain matches.