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Even though Real Madrid currently says they have other options if Mbappe fails to wear the Los Blancos uniform, I am sure Mbappe will choose Real Madrid compared to other clubs if he wants to leave PSG. Let's see what Mbappe's future holds next season after his contract ends at PSG and hope he chooses the right club as the next step to achieve his individual and club career.
I have the same thought as you, in fact I have had this thought since that time and also often say that Mbappe is actually a talented player who wants his career to be highly recognized in prestigious competitions like the UCL and of course that choice is Real Madrid because as you said that Madrid is king in the UCL so it is quite certain that Mbappe will choose to go to Real Madrid even though there are several other teams that will make offers but choosing Real Madrid will be the very right choice for him. we will all be looking forward to Mbappe arrival at Los Blancos to continue his career in achieving the UCL title.