Mbappe, who grew up in a gritty Parisian suburb, said his price tag will not affect his performances and that he would enter the changing room full of humility. This was a real option for me.
The 18-year-old addressed Monaco's fans in a message posted on his official Twitter account, saying: "I just wanted to thank you for all the love you've shown me during our time together".
As to what had motivated him to leave the reigning champions, who like PSG have won their first four games of the season, he added: "For me it was the project that was going to allow me to develop, to learn while winning".
He also praised the head coach Unai Emery for being passionate.
Mbappe reiterated that what happened was simple, but he would talk about it when the time comes.
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"It was a wonderful experience", he said.
"It gives me great pleasure to join one of the biggest clubs in the world, which possesses the ingredients to become the best". It was a whole new world.
"You always believed in me, encouraged me, helped me".
It's the highest standard of football they are permitted to play in and Ben Afra has been forced to slum it alongside semi-professional and amateur clubs. I have a lot of respect for [Monaco vice president] Vadim Vasilyev, who is a remarkable man.
Mbappe, pursued by a number of Europe's elite sides after impressing in 2016/17 to help Monaco win the French title and reach the Champions League semi-finals, detailed his objectives and revealed he had meant to stay another season at Monaco.