Barcelona, who lost the game 4-1, were awarded a penalty in the 26th minute after Layvin Kurzawa accidentally brought Frenkie de Jong down inside the box. Lionel Messi stepped up to take the kick and emphatically finished it to put the Catalans 1-0 ahead.
Neymar, who missed the match due to an injury, took to Twitter to condemn the decision. The Brazilian wrote, "Joke that penalty" in Portuguese, accompanied by laughing emojis. However, the 29-year-old swiftly deleted the tweet, but by then many had already seen it.
Meanwhile, in the absence of Neymar, his partner-in-crime Kylian Mbappe blew Barcelona away with a sensational display at Camp Nou. The 22-year-old Frenchman levelled the scorecard just five minutes after Barca had taken the lead through Messi. Mbappe moved away from Clement Lenglet after receiving a delicious pass from Marco Verratti and slammed the ball past Marc-Andre ter Stegen from close range..
He doubled his and PSG's tally 20 minutes into the second half, firing the ball in after it had fallen for him following a poor Gerard Pique clearance. Moise Kean got PSG's third just five minutes later as the Italian headed home from Leandro Paredes' floating free-kick delivery into the box.
Mbappe then sealed PSG's victory with a delicious, curling first-time shot in the 85th minute after the French giants caught the hosts on the counter.