First of all, Osimhen's contract with Napoli runs until 2025. It won't be easy to transfer him before 2025 because he is one of the best along with Mbappe and Haaland and the Napoli president rejected all offers for him in the summer transfer window. However, according to media reports, if Real Madrid can't sign Haaland or Mbappe, they will try to sign Osimhen as a plan C. I think this is a possible scenario because Real Madrid need to sign a striker of this class. So, I think there will be many alternatives for Osimhen in the transfer window. Everybody wants to sign a striker like him.
Unless a club wants to redeem the release clause and perhaps the fee will be quite high even though Osimhen's contract expires until 2025. Real Madrid's focus may be much greater on Mbappe, but it is possible that they will try to influence Haaland to move to Los Blancos. Manchester City probably won't let Haaland leave because he is an important asset for the club now, so it is likely that Mbappe will be much more likely to be brought in by Real Madrid than Haaland in the upcoming transfer market.
Real Madrid is in a quite difficult situation, they need strikers like Kylian Mbappe, Erling Haaland and Victor Oshimen, but each club, such as Manchester City, Napoli and PSG, does not want to let go of the striker who plays an important role for each of these clubs, especially this club which is struggling hard in the Champions League if they let go of one of the strikers who plays an important role for the club then it will slowly reduce their performance, but yes among these clubs only Kylian Mbappe is the closest because Mbappe is almost at the end of his contract and is reluctant to extend his contract with PSG but Basically PSG really wants to keep the striker.
I don't know what will happen in the future, but what is clear is that I really hope that Real Madrid can recruit one of these strikers to replace Vinicius Jr. who is currently injured. Moreover, if Vinicius Jr. recovers, he can't have full expectations because this season, Vinicius Jr has suffered 2 injuries and with this, of course will affect the player's performance, so Anclotti has to think about other options to bring in a striker who can be relied on this season to support the club performance.