RTL says Mbappe has told friends he won't be hanging around should high level threats to sell Neymar be carried out.
The France striker sees Neymar as vital to PSG's Champions League chances and has no interest in carrying the club on his shoulders should his senior teammate be sold.
"The players are going to have to assume their responsibilities even more than before," Al-Khelaifi rapped.
"It has to be completely different. They will have to do more, work more. They are not here to have fun.
"And if they don't agree with this point of view, the doors are open. Ciao!
"I no longer want to have superstar behaviour."