The 35-year-old now looks back to his brilliant best after a difficult debut season in French football.
Prior to Saturday's Ligue 1 match against Nice, Messi had already scored six goals and provided eight assists for PSG this season.
He also scored four goals while on international duty with Argentina on their tour of the United States last month.
Messi carried on his excellent form against Nice on Saturday, putting PSG ahead at the Parc des Princes with a superb free-kick.
The seven-time Ballon d'Or winner won the foul himself, surging forwards and beating two players before being brought down just outside the area.
He then curled unstoppable effort past Nice goalkeeper Kasper Schmeichel and into the top corner to give PSG the lead after 28 minutes.
Vintage Lionel Messi! 💫— Football on BT Sport (@btsportfootball) October 1, 2022
Kasper Schmeichel stranded, the Argentine makes it look ever so easy.
Magnifique! 🤩 pic.twitter.com/yKEDJI8Cb7
Eagle-eyed fans spotted that at the moment Messi struck the ball, the pitchside adverts changed to show the word 'GOAT'.
PSG supporters on social media were also quick to label Messi the greatest of all time after his latest goal, which helped the home side win 2-1.
"Was, is and forever will be the GOAT," wrote one fan on Twitter.
While another added: "The Best EVER", followed by the goat emoji.
Messi's form this season is all the more remarkable, considering his struggles last term.
The greatest ever— TJbrown 🔴⚪️ (@tjbrown___) October 1, 2022
Was, is and forever will be the GOAT— AlcanShimmy (@H17SAN786) October 1, 2022
Even the advertising boards know.. 🐐— Ben Priest (@benpriest9) October 1, 2022
He managed just six league goals in his debut season with PSG after joining the club on a two-year deal from Barcelona in 2021.
Despite reports linking him with a return to the Nou Camp next season, Messi insists he is happy in France after finally acclimatising to his new surroundings.
"I feel good, I feel different from last year. I knew it was going to be like this," said the Argentine.
"I'm more comfortable with the club, the dressing room, my teammates, the game. I feel very good again, so I'm starting to enjoy it again."
Featured Image Credit: BT Sport