PSG might even be evaluating the possibility of selling him before Mbappe has six months left on his contract. I say this depending on what the news says about PSG. It looks like PSG aren't willing to release Mbappe for free just like that. But the only way to prevent this is to sell him as early as possible. But this time they will have to find a replacement for him immediately.
Real Madrid wouldn't even want to make an offer already now to not pay any transfer fee after hearing about Mbappe's words. Mbappe has clearly stated that he won't extend his contract any longer so there is only one year left. Real Madrid should be able to make a good striker signing for next season and just go on now