Lille beat Sochaux 1-0 on Wednesday thanks to Gervinho's goal to go six points above second-placed Olympique Marseille with two games left and a better goal difference of eight.
Only the biggest of calamities can deprive the "Mastiffs" of their first league title since 1954 and a remarkable double for a modest club having won the French cup, also against PSG, last weekend.
"It's starting to feel good but it is not mathematically done. We will try everything to get the title in Paris," Lille coach Rudi Garcia told reporters.
"It's like the end of last season, we are coming off four straight victories. Apparently we've got a 93 percent of winning the title, I've heard that, it must continue."
One of France's most famous clubs looked to have hauled themselves away from trouble but last weekend's 1-1 draw with Lens, who equalised in injury time despite knowing they were relegated, seriously damaged the principality side's chances.
