PSG will not sell Mbappé for a high price, even if they extend the contract for another year. Mbappé seems to have determined that his next stop will be Madrid. He turned down many offers from big clubs. Continuing to prolong this transfer will cause damage to both sides, but the one who will suffer the most is probably PSG. They could lose Mbappé entirely without getting any money.
That's right, Madrid is the beneficiary, and PSG has to sell Mbappé to them at a cheap price. Madrid is the one who decides. They can buy Mbappé, and Haaland is also a suitable name for them to spend money on. If PSG keeps the transfer price tight, Madrid is ready to find another player.
It would be very funny if PSG sold Mbappe at a cheap price, Mbappe's previous value was more than 200 million how could he be left at a cheap price now? besides that do you think with Mbappe's contract extension by PSG they will not benefit? don't be too naive in this case because even if Mbappe's goal is to leave but with the previous contract extension it indicates that PSG does not want to lose their money. Even if in the end PSG will also not be too long in the fry from the price issue but still he will be one of the most expensive transfers in the end.
Even right now nothing is clear about Kylian Mbappé contract with PSG, but one thing is sure his tenure is going to end in 2024 with this trigger is only in hands of Mbappé that can he want to extend his contract or not with PSG can't do anything which is really miserable right now but things will be clear in near future because 31 July 2024 is last date, so hopefully things will be cleared by both parties but most chances we will have new destination for the star player with where he is going it is not clear Real Madrid or Liverpool both are strong candidates for him, but financially Liverpool is surely much better because they are also ready for this all.
If we have him as free agent then surely things will be interesting because Real Madrid wants him as free agent but again if we have something special then surely most chances Liverpool is going to spend huge amount for him.