It's just speculation but I think Osimhen is the most viable option at the moment after they were left behind by Mbappe. PSG still dominates in Ligue 1 even without Mbappe, but at European level their strength will drop drastically. Mbappe really carried PSG. Osimhen has a release clause of €130m. That's a big price but It's not a problem for PSG. Unfortunately they had to release Mbappe on a free transfer. They should not have to pay €130m because Mbappe's market value is around €150m.
Why almost everyone thinks PSG is going to do really bad because mbappe is no longer with them is something I'm not really coming in terms with, my reasons are because before now, after he announced he will be leaving PSG by the end of the season Enrique stared getting the team ready a d used to not depending on him for victory, although several attempts didn't really yield much but it did showed they could get better.
There were games PSG played without mbappe in the just concluded season and they were still very successful, they won a few and drew a few aswell, only a few losses were recorded one of which was while mbappe played. So before his exit, the team has been aware and have prepared for it aswell, they have also got a smart and brilliant coach who is tactically sound, so it may not take too long and PSG may even do good again in the Ligue 1 but may have challenges outside the french league. Replacing mbappe with osimhen wouldn't be a bad idea and PSG has got the financial strength too.
Just like mbappe, osimhen is young and talented player who's got a very promising future ahead in his football career and it's quite obvious that he's got a top notch quality, the price clause he has released is worth it because even at Napoli he was of a great importance to the team and if not for his personal decision to leave, I doubt if Napoli was ready to let go of him just yet just like mbappe, it's really funny how placing this two young talent's side by side and you will find too many similarities.