Yeah no one expect Napoli got humiliated by AC Milan, usually even Napoli is lose, the margin difference is just 1-2 goals. But the situation between AC Milan and Chelsea are different, Stefano Pioli is still managing AC Milan until now and AC Milan have Rafael Leao which is one of the best left winger.
Chelsea don't have any star player, just a good player since there's no one can carry Chelsea during bad performance. Graham Potter was been sacked and they're trying to find a new manager. Currently Bruno Saltor is managing Chelsea, he haven't managed any club in his whole career.
Napoli lost 4-0 against AC Milan in Serie A. This was a surprising result. Because Napoli is in great form. No one expected them to lose 4-0. I think it was Napoli's match strategy. Because a few days later they will face AC Milan in the Champions League match. It is certain that Napoli will win the Serie A title. Now their aim is to perform well in the Champions League. And in the midst of the defeat in this match, perhaps the Napoli coach is well aware of Milan's match strategy. I expect we will see Napoli dominate in the Champions League matches.
in Serie A a 4-0 defeat to Milan is not a big problem for Napoli but in the champions league, it will be a bad thing for them, but I'm sure spalletti will use a different strategy in the 1st UCL leg later, he's unlikely to use the same strategy, especially in the 1st leg it will take place at the san siro