1) Thiago Silva: Milan to PSG, £35.5m, 2012
The Brazil international moved to the Parc des Princes in the summer of 2012 as part of the same deal that also saw Rossoneri striker Zlatan Ibrahimovic move to the French capital too.
However, the central defender has more than lived up to his whopping price tag in the intervening two-year period and is now rightly regarded as being the best centre back in the world.