I think the reason for the drop in Osimhen’s market value will be because of the issue surrounding his move to Galatasaray and the kind of deal Napoli is offering. I see no other reason for the drop because despite the circumstances around his move he has being performing well for Galatasaray. It is good news that Napoli are finally deciding to reduce his price tag, this will make it easy for interested clubs to make a deal for his services in the summer.
It is normal if Osimhen price is decreasing because he still doesn't win any trophy with his current team. Osimhen is also not in the top leagues in Europe anymore. So, I can understand if Osimhen price is no longer as expensive as in the previous season. However, I don't see any decline in Osimhen performance, he is still one of the best striker in the world. Because the price is already around €75m, I think it is more possible for Osimhen to leave Napoli in the next season. I hope he will move to Arsenal, PSG, or Real Madrid.
For any potential team to place a higher bidding, they're confident about the competent performance of the club, how they're able to sensed the trophies cabinet of a player. Any player that's worthy, there ought to be evidence of winning important titles like the UEFA Champions League, that's to show how determined and serious is that particular player and not some player that only exhibits stellar performance without having trophy to his name. Victor Osimhen been one of the very best attackers in Galatasaray is important for his football career. Unfortunately for the Nigeria international and reasons why his market value is not increase is simple, Osimhen is yet to lift important trophies apart from the domestic scudetto he lifted with Napoli.