Kylian Mbappe very recently made a big-money move to Paris Saint-Germain last summer and also accompanied Neymar in Paris. This season was only his second ever in the top flight and he is already rubbing shoulders with the veterans.
He might not have had much of an influence against Real Madrid in the Champions League this season, but neither did Neymar had it, just for the record. However, his 13 goals and 8 assists in 27 league games is a testament to how important a figure he has been for the Parisiens.
On top of that, he played on the right-wing, something that is not his most suitable position. For France, he shall play at the left and be much more influential than he was for PSG.