Osimhen is currently not happy in Napoli, he extended his contract with this team but still, Osimhen can leave Napoli to another team. This can be a cheap transfer for Chelsea or any other team but it seems there are some possible destinations for Osimhen in next summer like Real Madrid to have an alternative option for Mbappe and Chslea to improve the team.
According to the current saniario, the clubs that have approached Victor Osimhen, looking at their situation, I think that Chelsea will be Victor Osimhen's next destination, because if you look at Real Madrid, Kylian Mbappé is more important than Victor Osimhen. Givers appear, and there is clearly a reason for that, which is club-style play. Real Madrid's tactics and game play are based on fast direct forward passing, in which you need a quick, fast-finishing striker, and Kylian Mbappé can do better than Victor Osimhen. Osimhen gets into a solid CF position. Can play behind the wheel or come into deep instruction, while Kylian Mbappé is a fast player who has a better influence on drifting wide and beating the defensive line.
So I think Real Madrid are more interested in replacing Victor Osimhen with Kylian Mbappé, so Osimhen's next destination, Chelsea, would be a better option. And besides, it will be better for Chelsea because Victor Osimhen has a lower market value than Kylian Mbappé.