The 18-year old scored 24 times last season to help Monaco win their first league title in 17 years.
Mbappé took time to thank his lawyers who he claimed "went out of their way for a good cause" making reference to the arrangement between both Ligue 1 clubs leading to his loan deal with PSG.
PARIS SAINT-GERMAIN travel to Metz looking to continue their outstanding Neymar-fuelled start to the Ligue 1 season.
"I have a lot to learn and prove but in Paris I will be able to do that, while winning".
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.
"It's a great pleasure to join PSG, a very ambitious club that wants to become the best", he said of his move, according to Associated Press.
"I'm not receiving the money and it's coming out of my pocket".
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"I always thought: "I want to be there, I want to be one of those big players who is trying to give people fun out of the game", and I have given everything to reach that objective".
PSG beat Arsenal to sign Kylian Mbappe this summer.
"Of course Neymar's [presence] is an added bonus".
The Arsenal chief said: "Well, I believe that we were on the case a year ago". "It is extraordinary to play with him".
But it was not for a lack of trying from manager Arsene Wenger in the transfer department because, apparently, he met with one of the most promising young talents in world football in an attempt to convince him to move to the Emirates.
"It won't change my way of living or thinking".
"It's been put on standby, but I'll have to get back on the case", said Mbappe, whose mother drove him to training at Monaco.