If Osimhem is the striker that Real Madrid is targeting then in the previous transfer market Real Madrid will definitely make an offer to Napoli and I'm sure it will be difficult for Napoli to refuse that offer. But in fact, Real Madrid did not make Osimhen their main target and still favored Mbappe as one of their desired targets. Mbappe has much better advantages compared to Haaland because this typical player is much stronger and masters playing positions on the wing or as a central striker.
Haaland is only able to complete passes to score goals, but speaking of needs I believe Haaland and Mbappe are two figures that Real Madrid really needs. If both of them can be brought in in the next transfer market then I think the Real Madrid squad will be much better and will produce striker who are quite feared by any opponent.
For the next season, Real Madrid will arrive Brazilian youth players Endrick have quit well performance with Fluminense and help his team won Brazilian Serie A for this season. I don't think with Real Madrid want to priority for signing Victor Osimhen current will have highest valuable above 150 million euro. Real Madrid main target is sign Kylian Mbappe with potential become free agent next season not make Madrid must spending much money for fees transfer than sign Victor Osimhen and need spent much money for getting deal agreement with Napoli.
I don't think Madrid face difficult with their striker in this season although Joselu not consistent scoring goals on every match, Rodrygo become good option to be false nine and his performance very quit well for scoring goals. If can't sign Mbappe or Osimhen next season I think Madrid will try with nine false scheme with Rodrygo as number 9 striker.
I would completely rule out the possibility that Osimhen ever plays for Real Madrid when at the same time Mbappe becomes a free agent. The point is that whatever Real Madrid would pay for Osimhen as a transfer fee, they can just pay it as salary to Mbappe and make him sign a long term contract. Osimhen isn't even close to Mbappe in my opinion and outstanding world class strikers are so rare. Haaland, Mbappe, and then who else? Mbappe will also be in the limelight because of his importance to the national team. There is really not a lot that would justify choosing Osimhen over Mbappe. Actually, there is nothing I believe in regards to quality as a football player.