We've had a great run, we came into this game in a great frame of mind but it was a big step up, they have quality from the goalkeeper through to the striker and there is a reason why they're one of the favourites and that's the level we need to aim for at this club.
Kimpembe opened the scoring from a corner but Mbappe's sensational sweeping finish from a swift counter put PSG in the box seat - the French star's pace leaving United's defenders in his wake.
In their absence PSG still succeeded in inflicting a first defeat on United since the appointment of Ole Gunnar Solskjaer as their interim manager. "But considering how many players we were missing and others not in great shape, it was great to win here in these circumstances".
The World Cup-winning forward scored PSG's second goal on the hour at Old Trafford after Presnel Kimpembe's 53rd-minute opener as Thomas Tuchel's team took firm control of the tie before the second leg next month.
The Norwegian has overseen 11 victories in those games and has completely transformed the fortunes of the Red Devils, and they head into the tie eyeing up a famous success.
"We are going to have to go down there, believe in ourselves, play a good game and improve from today obviously".
Buffon became only the fourth player to feature in the Champions League at the age of 41, so is this a hint that PSG should activate the extension clause in his contract? United, in fact, looked more threatening on paper with Pogba, Martial, Rashford and Lingard all in top form coming into the match. When he plays he needs to find himself.
"I must thank my teammates for an incredible performance", the Italian said.
Di Maria, whose every touched was booed by the United fans following the manner of his departure from Old Trafford in 2015, then set up Kylian Mbappe seven minutes later.
"Maybe he was a bit nervous and a bit overused because he plays all the time for us". I want us to be able to help him with good passes. We have to bounce back, we're in a tournament and the Champions League is always going to be hard.
"Don't give him that space to go into, but he's lightning quick of course".