Which player will be sold for the highest transfer fee this summer?

Kylian Mbappe. (Lionel Cironneau/AP)

The transfer window is officially open, which means we can expect a flurry of transfer activity this summer with some of Europe’s biggest teams spending mega-bucks on the best players in the world.

All of which leads us to ask: Which player will be sold for the highest transfer fee this summer?

Have your say by voting in Sportsnet’s poll and posting your comments below!