3) Luis Diaz (Liverpool) – €110m
The Colombian made a huge impact after arriving at Anfield during the January transfer window, and it appears the Reds got an excellent deal after paying only an initial £37.5m for the player.
Whether Diaz will kick on during his first full campaign with Liverpool, we shall have to wait and see, but many believe that the Merseyside club’s recruitment team have pulled off yet another masterstroke.