Throughout Chelsea's finest Premier League years, Ashley Cole was a vital figure for the Blues. The left-back helped take Chelsea's defence to new heights, and it came as little surprise that he eventually managed to help steer the club to Champions League glory.
Father Time eventually caught up with Cole, who left the club in 2014. Since then, Chelsea have tried to replace him with Filipe Luis, Abdul Rahman Baba, Cesar Azpilicueta and Marcos Alonso, with Azpilicueta the only of those to actually make a positive impact at the club – and even then not always on the left.