#3 Ousmane Dembele to Barcelona
With Kylian Mbappe's late-season emergence, Dembele has been momentarily reduced to "The other wonder kid from France" tag. But don't let that deceive you – he completed the most number of dribbles in La Liga last season, provided more assists than any one bar Emil Forsberg, and was behind only Neymar and Cristiano Ronaldo for Champions League 2016-17 assists (despite being knocked out in the Quarter-Finals).
Having lost out on signing him from Rennes last summer because they couldn't offer first team football, Barcelona turned up at Dortmund's door this time around. "No way," Sporting Director Michael Zorc's reply was emphatic.
Dortmund fans, enjoy him while you still can. As early as next summer, he could be looking up to and lining up alongside Lionel Messi.