Of course, they are at the top of the Serie A standings and it is imperative to maintain that position until the end of the season, as I said before that their opponents in the Europa League are only Spartak Moscow.
Spartak are at the bottom of group c, they've lost motivation and Napoli don't need to put their full strength into it against Spartak.
I agree with you, but I have a slight feeling that the match against Spartak will be difficult. There is a rumor, and I think it is even officially confirmed, that Napoli's president would like to play in Moscow on a neutral field, and not on Spartak's field, so there is some apprehension, and therefore there is fear, at least for the club president