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Kylian Mbappé had put PSG on course for all three points with a ninth-minute strike, before the Germans hit back to turn the game on its head thanks to Andre Silva and Nordi Mukiele.
But Messi then entered the fray to score his second and third Champions League goals for his new club, rescuing all three points for Mauricio Pochettino's side.
MESSI WHAT A PENALTY TO COMPLETE THE COMEBACK AND SCORE HIS 2ND GOAL TONIGHT :fire::fire::fire: pic.twitter.com/0qaDEH3UXy- mx (@MessiMX30i) October 19, 2021
His second was a close-range finish from inside the box, but the third was a penalty that was executed in some style. Messi waited for Hungarian shot-stopper Péter Gulácsi to dive his left-hand side, before chipping the ball straight down the middle of the net.
The 34-year-old has now scored all three of his PSG goals to date in the Champions League and is still waiting for his first goals in Ligue 1.