Serie A teams still have one more week before the new season starts officially. They can make use of this period to do last touches to their squad to be even stronger for the beginning of the season. Napoli don't need to add many players as they are keeping their squad quality nearly the same as the previous season.
Milan have also signed so many players so far to strengthen various positions. They might also slow down from now on. Inter might add a couple of players maybe just to increase the number of alternatives. But I think Juventus need player additions the most now especially into the midfield.
One week should be a long time for them to deepen their strengths and devise strategies that they will implement later. Unlike La Liga, the Premier League and Ligue 1, which started their competitions a few days ago.
They will now emphasize more on mentality in my opinion, because they have already played friendly matches, and they should be evaluating their shortcomings from the pre-season matches.
Napoli hold the status of defending champions, defending will be more difficult than winning.
Osimhen still has 2 more years so he doesn't need to be in a hurry to sign an extension with Napoli yet. He would just concentrate on his game after recovering from his injury.
But after this season ends I think the situation will get really serious for both sides. Because Napoli will have to face the danger of losing him for free if they don't sign a new contract with him. But if Osimhen gets the attention of bigger teams next summer it could be quite difficult for Napoli to attract him into a new contract. Napoli might have to offer too much money compared to now to increase their chance of keeping him.
That is the scenario why Napoli must offer a contract extension for Osimhen, because it will be a loss in terms of sales if they have to lose Osimhen for free. The situation would be the same as the French star who is now at Paris Saint Germain. Paris Siant Germain is in danger of losing the player for free because Mbappe is reluctant to extend his contract with this rich club.
Now perhaps Napoli can relax for a moment because Osimhen himself is still a little long until his contract expires. But I think Osimhen will be willing, because he knows the club that raised his name is Napoli.