Napoli couldn’t achieve anything in the Champions League even in their best years with Spalletti, and now I also doubt that it’s worth expecting anything from them. As for Inter, perhaps the match against Udinese showed that without Inzaghi they will be weaker, and I’m not sure they are capable of repeating the same success in the Champions League again. Juventus, by the way, is also not the kind of team that can go far in this tournament.
Napoli is actually a struggling club, and clubs like them don't know how many years it will take for them to actually be able to win the Champions League. It will take them a longer period to be able to achieve this kind of goal, so there is a need for them to get a management that will be up to the task, so that they will be able to step up there gamble because winning a trophy is not just about the club. At the same time, they have to do better than what they are doing now because they are not taking things serious that is why they are in that position.
And I feel like Juventus and Napoli are on the same page, and this is one of the reasons why people who are winning the Champions League have invested a lot, and that is why they can win the Champions League because of the investment and this is not about money alone and this is the same time about team investment in terms of consistency and many more.