Bradley Barcola and Goncalo Ramos were also on target for Luis Enrique's side, which responded to its midweek defeat against Liverpool in the UEFA Champions League by moving 16 points clear at the Ligue 1 summit.

PSG broke the deadlock in the 27th minute as Desire Doue released Barcola, who curled home his 13th league goal of the season.

Barcola turned provider as the visitors doubled their lead five minutes after the restart, cutting the ball back for Ramos to slot home, though Lilian Brassier's header halved Rennes's deficit soon after.

However, Dembele came off the bench to put the game beyond the hosts with two goals in stoppage-time.

First, Achraf Hakimi put the ball on a plate for him to bundle home, before he curled in an 18-yard effort to take his Ligue 1 goal tally for the campaign to 20.