Paris Saint-Germain forward, Kylian Mbappe, has called on his team-mates to show more personality, after they were thrashed 5-1 by Lille on Sunday.
The defeat delayed their Ligue 1 title celebrations by another week.
PSG were reduced to 10 men, after Juan Bernat had cancelled out Thomas Meunier's early own goal.
The French champions went on to concede four times in the second half for their heaviest league defeat under their Qatari owners.
"It was a box-to-box game, some moments we were in control, some moments we were not.
"We're going to be champions but we cannot lose like this.
"It's not normal. We lack personality, it's one of our flaws, we have to correct this. We played like debutants," Mbappe told Canal Plus.
PSG will be crowned champions on Wednesday, if they win at Nantes. They have 81 points after 31 games, to second-placed Lille's 64 after 32 matches.