I have seen a speculation like this about Osimhen.
Source: Goal.comCould this really be true?

I mean is there really a chance that we can lose Osimhen in January? Because as far as I know he doesn't have a January clause and he is staying with Galatasaray until the end of the season.
I hope there isn't such option for him. Otherwise it would really be difficult to convince him to stay more than half a season. There will be an option to play in the Premier League on one hand in the end.
M.United does not seem realistic to me because Rúben Amorim's priority will be Viktor Gyökeres. They worked together at S. Lisbon and if there is a need for a striker, I think M.United will have Viktor Gyökeres.
There are two teams seriously interested in Osimhen, one is Juventus and the other is PSG.
Galatasaray unfortunately cannot compete with these two teams.
However, Galatasaray must prepare to lose Osimhen. He could finish his loan contract and move to a club he wants to compete in the top European leagues. Especially with Icardi's injury, they must prepare for several names that they can choose in the transfer market if Osimhen leaves the team.
At least they will be comfortable enough for this season and the injured player can recover quickly. When a very reliable player is injured and leaves the team, it will be a big blow for the team if they do not have quick anticipatory steps.