The 29-year-old was forced from the field on a stretcher after landing awkwardly during the Ligue 1 clash with Saint-Etienne.
Reports in France were quick to suggest that the South American superstar will be missing until January, and that will be the case.
PSG have said in a statement on the club’s official website: “The examinations carried out confirm that Neymar Jr suffers from a sprained left ankle with ligament injuries.
“An unavailability of 6 to 8 weeks is to be expected. A new assessment will be made in 72 hours to specify the recovery.”
Neymar posted on social media: “Unfortunately, these setbacks are a part of an athlete’s life. Now you have to raise your head and move on. I will come back better and stronger.”
PSG are due to head for warm weather training in Qatar on January 16, and it could be that Neymar only comes back into contention around the time of that trip.
If he is to miss the next six weeks, then he will be forced to sit out domestic meetings with Nice, Lens, Monaco and Lorient before the Ligue 1 winter break, along with the final Champions League group stage clash with Club Brugge.
PSG are due to face Lyon on January 9, but that contest may come too early for Neymar and it could be in a home game with Brest the following weekend where he makes his return to competitive action.