Guardiola and Messi helped establish a powerhouse at Barcelona, but this time they were on different sides of the pitch.
PSG struck quickly, and the strike came from an unlikely source.
Idrissa Gueye, a former Everton player, opened the scoring instead of Messi, Mbappe, or Neymar.
Mbappe started it all by cutting the ball back for Neymar, but he couldn’t finish it, so Gueye fired the ball into the top corner instead.
When Kevin De Bruyne crossed the ball back inside and Raheem Sterling headed it against the bar in the 26th minute, City looked certain to respond.
Messi has yet to score a goal for his new team since returning from a knee injury.
Despite a slew of chances to equalize, City went into the halftime break still losing 1-0 to PSG.
When the second half began, City had another chance to tie the game when Joo Cancelo caught the PSG defense off guard and hooked up with Sterling, but his shot at goal was well off target.
Phil Foden was brought in in the 68th minute to replace Jack Grealish in order to fuel the assault and break down PSG’s defense.
To force a clearance, he threatened with a pirouette on the perimeter of the area and a cross.
Messi scored shortly after after a one-two with Mbappe finished with the ball soaring into the top left corner, which was unfortunate for City.
It would be the game’s final goal, resulting in a 2-0 victory for PSG.