Napoli will need to keep their squad unchanged if they want to continue their good form and win the title. Napoli are playing well because the understanding between their players is very good now. Also we see good performance from Napoli in every match due to their good match strategy. If any of Napoli's key players leave the squad in the next winter transfer window, it will have a negative impact on their overall performance.
They will not want to sell their players in January and changes can come from injuries by World Cup or very high bids from super rich clubs. Most of clubs are not ready to spend too high budget for January transfer market. Star players don't want to change clubs in middle of season too.
We will see that what's gonna happening in the next transfer season. Napoli can change the decision anytime. There will be so much money coming for napoli. That will be so difficult to defend its players from higher salary offered by another team. The offer may not come for the second time. I think that napoli will consider it.
Napoli will need Osimhem to return without injury then they can give him one or two matches for resting, to recharge energy and to avoid unnecessary injury after all. They do need contribution from the striker, not only by his goals.
It seems like that some clubs may offer up to 100 millions for him. Napoli already given signal to sell him january 2023, some clubs have been preparing big money for him.