Needing just a draw to win the French title, defending champion Paris Saint-Germain was humiliated 5-1 at Lille on Sunday.
PSG needed a home win against Strasbourg to clinch an eighth French title last weekend, only to draw 2-2.
This time, PSG striker Kylian Mbappe had two goals disallowed for offside. PSG lost two players to injury and had its goal scorer Juan Bernat sent off—all in a frantic first half.
But the way PSG capitulated in the second half, when it let in four goals, exposed glaring weaknesses in the team, notably on free kicks.