"I had the privilege of coaching the best player in the history of football," Galtier told reporters.
"This will be his last match at the Parc des Princes, and I hope that he will receive the warmest of welcomes."
Messi, who has 21 goals and 20 assists for PSG in all competitions this season, moved to the French capital from Barcelona in 2021 on a two-year contract.
Despite the fact that he has consistently been one of his side's best players though, he's been booed by fans who have wanted more from him, and his manager thinks such treatment was unfair.
"This year, he has been an important part of the team, always available," he said. "I don't think any of the comments or criticisms are justified."
"He's always been there for the team. It's been a great privilege to accompany him throughout the season."
Messi's future at PSG has been the subject of much speculation recently, with a source close to the Argentina captain telling Reuters that he had received a formal offer to join Saudi Arabian club Al-Hilal next season.
