#2 Kylian Mbappe
Not much needs to be said about Mbappe's recent form. He scored four goals at the World Cup and became a champion with France at the age of 19. He has also scored four goals from just two starts in Ligue 1 so far this season.
Mbappe's age and immense talent mean that the Paris native would almost certainly command a world record fee. The issue for teams, however, is trying to convince him to leave the France capital. Realistically, there are only a few teams outside of Real Madrid and Manchester City who can afford him so this one may not happen next summer.