Mbappe is due to sign for Real Madrid when his PSG contract expires at the end of next month.
But the France international told RMC Sport: "For the moment I said I was leaving, but I am not leaving now. These are just words, I have not put any action into what I will do. It is certain that when I leave France it will be something difficult because I will never find what I had in France great stuff.
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"For now I'm leaving PSG, that's the only thing to know."
Told his mother has stated his next club is 'known', Mbappe smiled: "If she knows, you have to go and see her."
On playing in the Paris Olympics, with Real reluctant to release him, he added: "I no longer need to say what my intentions are, everyone knows. I think we have to let things happen, but the Olympics are special, especially in Paris. I don't know anything about it."