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if indeed Mbappe has the desire to get the champion league title Mbappe should consider an offer from Real Madrid because Madrid is one of the teams that has a lot of experience in the UCL. I even imagined how strong Real Madrid would be if it was true that Mbappe could be bought and it would be easier to win the Champions League trophy next season.
if I may guess at the moment Mbappe has indeed extended his contract with PSG but I am sure that Mbappe is already interested in Real Madrid and sooner or later he will join Los Blancos.
If he is with Real Madrid then he will get the UCL trophy easily, because Real Madrid is the winner of the most UCL trophy, indeed there is no doubt about the history of this club. But the fact is that last season Mbappe also stay at PSG, and also next season. It seems that Mbappe also wants to get the UCL trophy with PSG, if he succeeds in getting the trophy with PSG then he will have a new historical record with that club, I think he is targeting big name.