I think situations like injured players, decreased performance, will also be experienced by other Serie A teams, this has the potential to provide a balance for each club. So Napoli doesn't need to be dragged into this situation because they're not the only ones experiencing this, instead coach Luciano Spalletti needs to find a way to keep the focus of the players this season. The difference in points is the initial capital for them
Some non-local players may still be playing for their respective countries, but when they are able to maintain their physical and performance, then these teams will not lose anything.
Whoever the players are, they will still avoid injury, but they never know when it will happen to them. So far I haven't heard of players getting injured, so I guess it's safe.