Osimhen says that he is very grateful to Napoli for giving him such an opportunity to play in this team and achieve such a high status, and I have no doubt that he would not mind staying in Napoli, and continuing his career in this club. In addition, Conte will join the team in the new season, an ambitious coach who can try to breathe new hope into Napoli. And De Laurentiis does not want to let Osimhen go, or is asking too high a price for him, which does not give him much of a chance to leave Napoli.
Maybe Napoli will keep him and Conte as their new coach will also want him to remain in the Napoli squad for next season. But is Osimhen really willing and without being forced to stay at Napoli? that is something that will be difficult to answer. Osimhen is a good player and I think it would be better if he tried a new challenge with another team.
However, it is quite difficult if he is still under contract with Napoli, because if Napoli are willing to let him go then they will also charge a high price to the team that wants to recruit Osimhen and the question is whether the team is willing to spend big money for Osimhen?