It looks like Napoli are quite likely to keep Osimhen this summer. At least for now. Because there is no rumour regarding him to sign for another team these days. However there might be a chance for PSG to think of bringing him depending on Mbappe's situation. When they lose a player like Mbappe they need to bring another top player to try to make up for that.
Vlahovic has been rumoured with PSG maybe but in this case I think PSG can change their route to Osimhen instead. PSG are going to get 300 million euros as a transfer fee from Al-Hilal if Mbappe signs for them. They can surely use this money to sign a player like Osimhen.