PSG led the table by 12 points from Marseille when the season was suspended in mid-March because of the coronavirus outbreak, which has gone on to kill more than 24,000 people in France.
PSG top the Ligue 1 table with 55 points and will take on Nantes on February 5.
Brazilian Football Confederation officials presented Neymar with a national team shirt adorned with the number 100 on its back to mark his milestone.
Buffon, who played a record 176 times for Italy, has an option to extend his stay at the Parc des Princes for a further season.
The world's most expensive player, 26, arrived on an Air France flight from Paris and left in a wheelchair, a photo taken by one of his fellow passengers showed.
Neymar, the world's most expensive footballer, was stretchered off 10 minutes from time at the Parc des Princes as PSG opened up a 14-point lead in Ligue 1.
Neymar insisted that Paris Saint-Germain can still qualify for the Champions League quarter-finals despite losing 3-1 to Real Madrid in the first leg of their last-16 tie.
Apart from a freak loss to promoted Strasbourg this month, the super-rich star-studded team has been nearly flawless, amassing 50 points in 19 games.
The Spiegel claims Neymar earned 54 million euros at Barcelona last season, 8.5 million more than Lionel Messi.
The capital-city side have seen their early lead at the top of the table cut to one point this weekend after reigning champions Monaco thumped Lille on Friday.
Cavani and world-record signing Neymar squabbled over a penalty during PSG's 2-0 win over Lyon last weekend, which Cavani took and missed.
The Group B match at Celtic Park was one-sided and PSG led 3-0 at halftime with goals from Neymar, France forward Kylian Mbappe and Uruguay striker Edinson Cavani.
At 25, Neymar became the world's most expensive footballer when he was snapped up by PSG in a 222-million-euro ($264 million) move.
Paris Saint-Germain defender Serge Aurier is nearing a transfer to Tottenham Hotspur after the Ivorian was granted a work permit.
Tuesday's scrappy 2-2 home draw with unheralded Ludogorets meant that PSG qualified in second place in Group A.