PSG was forced to wait for their eighth French title in ten years when Marseille came back to defeat Nantes.
Marseille was on the verge of relegation after goals from Kylian Mbappe and Sergio Ramos in the first half and a 2-1 deficit.
PSG, who added a third through Marquinhos, will have to wait for the trophy after Marseille rallied to win 3-2.
PSG will reclaim the title with a point against seventh-placed Lens at home on Saturday, regardless of what Marseille does in Reims.
Mauricio Pochettino’s PSG is 15 points clear of Marseille with five games remaining.
After serving a one-match suspension for collecting five yellow cards, Brazil striker Neymar will return for the Lens match.
Argentina’s Lionel Messi, who has an inflamed Achilles tendon, will be evaluated again, as will Italy’s Marco Verratti (knee) and France’s Presnel Kimpembe (knee), who also missed the journey to Angers.
PSG, who had teenage midfielder Edouard Michut sent off in stoppage time, were forced to wait for a record-tying 10th French title as Marseille won at the Velodrome thanks to Amine Harit’s goal.
Marseille fought back from two goals down against Nantes thanks to penalties from Dimitri Payet, before Harit scored in the 75th minute to make it 3-2 and secure a crucial win for Jorge Sampaoli’s team as they pursue Champions League qualifying.
With only 15 points to play for, PSG leads by 15 points and has a considerably superior goal difference.
With a point against Lens at home on Saturday, they will be crowned champions.
“Winning the championship is really essential for us, and I hope we can do it on Saturday,” Pochettino told Canal Plus.
With a tenth victory, they will equal the record achieved by Michel Platini’s Saint-Etienne squad when they won their last championship in 1981.
As It stands