This evening according to L'Equip Mbappé has made his decision to leave Monaco. In their article they state:
"Mbappé has made his decision. The 18-year-old French striker, who scored 26 goals in all competitions last season, and linked to AS Monaco until 2019, wants to leave the club soon, and the choice of contenders is restricted in his mind."
Kylian Mbappé a tranché et veut quitter Monaco
They go onto quote: "The biggest European clubs are on the lookout, including FC Barcelona, which could take place after the sale of Neymar in Paris-SG."
They state: "An appointment has already taken place between the Catalan club and the entourage of the player".
This seems to follow on from the recent news of Neymar joining PSG for a record fee, and other top names becoming unrested in the current market or in seeking huge pay rises and transfer fees whilst the clubs seem to be offering them across Europe.