Kevin De Bruyne (Sold to Wolfsburg for £18m, 2014)
SUCCESS – The Belgian has rapidly developed into one of the finest young midfielders in the world, after making just three league appearances for the Blues.
Ryan Bertrand (Sold to Southampton for £10m, 2015)
SUCCESS – After bursting onto the scene at Chelsea and starting the Champions League final win, Bertrand slowly dropped down the pecking order and found himself at Southampton, who he has helped reach the top four of the Premier League this year.