The 24-year-old's second half strike moved the Stade Louis II club six points clear of third-placed Lille
A solitary strike from Emmanuel Riviere gave Monaco a hard-fought 1-0 win away to Rennes on Saturday night.The home side had the best chance of the first half when Jean Makoun blasted over the bar unmarked 12 yards out.
Monaco responded with chances of their own as Joao Moutinho went close from distance, while Riviere was denied by Benoit Costil.
The visitors continued to threaten as the first half drew to a close, and Rennes again had Costil to thank for keeping out an effort from Layvin Kurzawa.
But Claudio Ranieri's Champions League-chasing side weren't to be denied after the interval and Riviere duly broke the deadlock on 55 minutes.
Jeremy Toulalan picked the striker out, with the 24-year-old finishing well into the bottom left hand corner to make it 1-0 to Monaco.
The visitors nearly doubled their advantage late on when Geoffrey Kondogbia's long range effort was clawed away by the impressive Costil, but in the end a single goal proved enough to seal victory.