The image of Neymar punching a fan went round the world. It occurred after PSG's loss in the French Cup.
The French Federation acted on it and gave Neymar a three game ban. A pumishment which could be another two if he does it again.
In any case, Neymar will be able to play against Angers. It is curious that he can play this weekend when the ban has already been made public, but there is a simple explanation: the Federation made it clear that that the ban does not kick in until Monday.
So Neymar can play this weekend. He will miss the last two PSG games this season, against Dijon and Reims. He will serve the third game next season... as long as he stays at PSG.