I know Napoli got a rich owner and he can have enough money to make Osimhem stay in Napoli for the next season and since Victor Osimhem is a young player he can easily be sold for a expensive price in the next season if he improves himself. But since there are many tempting offers for Osimhem in the next season from teams like Real Madrid I think Napoli should start seeking an alternative player to replace Osimhem next season, otherwise, they will have problems just like what happened in the game against Ac Milan they failed without Osimhem.
If we look at the statements from the owner of Napoli, it is clear that he is serious about developing his club, so what Napoli has achieved this season is from the work done several years ago. It would be a shame if Napoli only became a club that won once and dropped in performance next season, but because Spalletti is rumored to be leaving Napoli so the next step will depend heavily on the new manager, it will really need their core players to stay at Napoli while they are looking for other players in the transfer market so that when some of these core players really leave it doesn't give a big gap in appearance they didn't even make a difference because everything was so well prepared before the players left.