€75 million in total is not that much for any of the major clubs. It's probably about the position being free and going through most of those major clubs, I don't know wich one us currently looking for a center forward like Osimhen.
There are not many clubs in Europe who would be willing to pay €75m for a player and for Napoli this would be the 2nd most expensive sale in the club's history!
If Osimhen were to be sold for €75m he would be one of the top 50 most expensive sales ever and that's not something you see every day. In the 24/25 season there were perhaps only a few players who were sold for such high sums, I think there were certainly no more than 3-4 players! So selling Osimhen for that price won't be that easy.