Still conditioned, as well as by injuries (see Neymar), by the controversies following yet another failure in the Champions League, PSG had to wait for injury time to grab the 2-1 victory on the Brest pitch, thanks to a goal from usual Mbappé.
The advantage of the Parisians was signed by Soler in the 37th minute, but just six minutes later the Bretons equalized through Honorat.
Shortly after the 90th minute, Mbappé's winning goal arrived after a pass from Messi.
Now PSG are first in Ligue 1 with 66 points and +11 over Marseille, who are playing against Strasbourg.
The advance between Lille and Lyon ended 3-3.
The race for third place sees Monaco receive Reims and Lens stage in Clermont.
External commitments also for Nice and Rennes.
Matchday 27 overview
Lille-Lyon 3-3
Auxerre-Rennes 0-0
Brest-Paris SG 1-2
Clermont-Lens 1pm
Ajaccio-Montpellier 3pm
Angers-Toulouse
Lorient-Troyes
Nantes-Nice
Monaco-Reims 5.05pm
Marseille-Strasbourg at 20.45