Monaco failed to get back on track after their poor Champions League loss to Porto in midweek, drawing at home against Montpellier.
Substitute Souleymane Camara grabbed a dramatic stoppage-time equaliser as Monaco were held to a 1-1 home draw by Montpellier and missed the chance to go top of Ligue 1.
Champions Monaco did not produce a vintage performance on Friday, but Radamel Falcao's 12th goal in eight league games, scored seven minutes before the break, continued a stunning individual start to the season for the striker and looked like it would prove decisive.
But Monaco failed to build on that lead and Camara headed home in the second minute of stoppage time to grab a draw that Montpellier deserved.