I am almost sure that he will not go to Saudi Arabia 
Mbappe is a football player who pursues his dreams at a young age. If he is determined to go to Real Madrid, no team can take him. I think he will play for PSG one more year.
Saudi Arabia may well be a real option for the transition stage before the end of Mbappe's agreement with Paris Saint-Germain, no matter how fantastic it would have sounded six months ago. At least there seems to be such an offer from the Saudis to invite Mbappe to Saudi Arabia for a year, given the damaged relations between the PSG leadership and the player. Then PSG would get money for rent, and the player would get game practice, and I'm also not sure that Luis Enrique is excited about the idea of building the future of the team around a player who will leave after a season. Mbappe is a football player who pursues his dreams at a young age. If he is determined to go to Real Madrid, no team can take him. I think he will play for PSG one more year.Is this serious, I am absolutely sure that Mbappe will not go to the Saudi League. Mbappe earns a large salary at PSG, and after his contract with PSG expires in June 2024, he will certainly get a signing-on fee bonus of € 150 million stated in his contract. that is why, the Mbappe drama saga has become a hot topic of conversation to date. as said by the President of PSG, that they will not release the star with a free agent. that means, apart from losing his star, PSG will pay Mbappe according to the contract agreement.
But the problem is which club will sign Mbappe at a very high price. plus, the salary is quite high. and even if a club is interested in signing him, it is not certain that Mbappe is willing to join the club, the only thing Mbappe wants is Real Madrid. before in this post, I have reviewed matters related to Mbappe in other threads with the assumptions and speculations that I said.
We'll see, after all this summer transfer market still leaves a lot of time. and the question is whether Madrid will bring him to the Santiago Bernabeu in this transfer window. if so, we can be sure that the two clubs and the player will try to find a solution so that it can be mutually agreed upon. ideally, Madrid would be sharper if Mbappe was present with them and would make Carlo Ancelotti's squad even more competitive.