PSG’s record signing took the spot-kick instead of Lionel Messi, who missed a penalty of his own against Real Madrid in the Champions League on Tuesday evening.
Neymar tried to roll the ball into the back of the net with minimal power, but his effort was tame and goalkeeper Alban Lafont saved it with ease.
That came in the 59th minute, at which point Nantes were leading 3-1.
The hosts made the breakthrough at Stade de la Beaujoire in the fourth minute, with Liverpool target Randal Kolo Muani finishing off a brilliant counter-attacking move.
Can Paris Saint-Germain win the Champions League this season? Let us know in the comments below!