Nasser Al khalifi will not let Mbappe move to Real Madrid for free. He had spoken and wasn't happy about the decision of the player to not extend his contract and activate the 1 year renewal option. This put PSG administration in an awkward position and all of them will be convinced that his departure this season is essential for the team since they are the only one losing in this whole story.
Mbappe have a good salary. Real Madrid will get the player for free next season. PSG will lose him once for all for free and this isn't good for them. They will make him move for a good price by the end of this transfer window!
I understood that he doesn't want to, but between the will and the contract and the law you can't do much
you have to play the game of the law which is sometimes in your favor and sometimes not
these childish behaviors make me laugh and piss me off at the same time
Law also says that they can sell him to another club, of course you need Mbappe to agree to that, but they do not have any type of responsibility to keep him, and that means they can just sell him if they want to. In this case, if Real really wants him then PSG could sell him to Real Madrid even this season, so instead of having him for free next season, they will have him one more season.
Of course why spend that much money for just one more season, but that's the risk you take, otherwise he can sign with someone else next season as well, if offered more money. I believe that we are going to see Mbappe stay at PSG one more season for sure, not going to be a simple thing but it will most probably happen and should be a problem all year long.