With current position, i think the chance for Napoli is a bit difficult. I know Inter just 3 point ahead Napoli, but if Napoli also made another mistake, 3 point will become more far away. Even inter have another big match with another competition schedule, they will start to keep their points gap with Napoli still save. Just few match away, very possible to secured their position.
The chances may be small, but if Napoli can make changes to perform better, there may still be hope that they can pursue. Napoli should have utilized the tight match schedule that Inter Milan has, but in fact they performed far from expectations so that they lost the opportunity to catch up on the points difference. In the remaining matches, Napoli might be able to take advantage of it, but if they get bad results again, their chances will be even smaller.
Serie-A is the most competitive in terms of competing for the title because the points difference between first and second place is very close, so that the determination of the title is still uncertain. Different from several other leagues because the points difference is quite far so it is difficult to catch up.