Lukaku has been moving on loan for a couple of years now, i hope he can finally be sold now and move away from Chelsea for good, all these different loan moves hasn't helped his career, though i know it is due to his transfer fee and salary/wages. If Napoli sell Osimhen, they will receive a lot of money from the transfer, so they should be able to use that and fund a transfer for Lukaku.
I feel Napoli are hesitant to sell Osimhen out because it might be hard to get his replacement but from what I've seen of Lukaku, he fits the bill. Granted, he may not be able to leap in the air like the Nigerian, but he can still be able to use his size to his benefit. Truely, the Belgian needs to be bought permanently by a club because continuous loaning of a player can affect his performance; he won't be able have roots.
As for Osimhen, he should leave the club now he's still a hot cake because the way I see it, if he continues to remain at Napoli and doesn't give good results, his value will be dropping gradually especially now that Antonio Conte has taken over the job from Walter as coach. I doubt he'd be seeing much playing time like enjoyed under Walter and the coaches before him.
Napoli signing Lukaku is solely dependent on the sale of Osimhen. Yes, Conte has let the club understand his preferred Candidate in the attack. I believe that the club willl begin talk with Chelsea when they can finalize Osimhen deal.
Right now, there are speculations that PSG has started discussing with Osimhen entourage. I think PSG x Osimhen is one to watch for the window.
Although they plan to sell to be able to make concrete move for him. But he’s on their radar.