As a Galatasaray fan, I sure do hope that United doesn't figure out a way to get Osimhen right now. If Icardi was healthy then I wouldn't mind much, I mean we knew that Osimhen is with us temporarily because of the situation, so him leaving isn't really a shock and could of course happen, but right now we are missing Icardi, he is injured probably until the season ends, or at the very best case early May or something. Which means, if Osimhen also leaves, we would be left with a single striker who would be Batshuayi and he isn't great enough to be our starting striker. Obviously if this happens, we would be in a rush to get a good striker, and that could potentially end in a very bad way for us.
I hope Manchester United can figure out a plan to get Victor Osimhen as a Manchester United fan. Last I checked Victor Osimhen is on loan at Galatasaray and he has expressed his intent to play in the Premier League, which has given Manchester United the green light to push for his transfer. I understand your plight, I know Victor Oshimen is undoubtedly an elite striker and he has been instrumental for your club Galatasaray but it's normal for a player to desire to play for a more reputable and higher team which will add value to his brand globally.