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Kylian Mbappe was a great player and he deserved the salary he received from PSG. He contributed goals to his team in almost every match. Not every player can achieve such a feat. Mbappe is now most likely in Real Madrid. A similar success may follow in Spain. Mbappe is a great player and an all-around finishing striker. He is talented enough to play in any position. He is now a legend for PSG. Next, it's time to become a legend for Real Madrid.
He has contributed to PSG for 7 years and has won various titles and can be said to have been an extraordinary player during that time. From the club's all-time top scorer to the highest paid player, Kylian Mbappe is already pinned down and he just needs to win the title he can't win with his new club later.
I think this is what Kylian Mbappe wants after being satisfied with PSG, he just needs to expand his career elsewhere and there's nothing wrong with him becoming a Real Madrid legend. But it will still be just the beginning and it will definitely be very difficult to be in a team with competition from some other great players. He is certain to win the title every season, but for individual awards it will be the most difficult thing at Real Madrid.
I see people say Mbappe was not loyal to PSG because he didn't stay there and he left the team. While he didn't leave for money, he left because he wanted to play for the team he likes not for money and anything else. Mbappe played for years in PSG and to be honest he helped his team a lot and earned achievements in the past.
While now this can be hard for PSG to find a replacement for Mbappe since he has been playing there for years. However, Enrique said they would use the whole team to fill the place of Mbappe in PSG, which means instead of hiring superstar players they want to have better teamwork.