Jose Mourinho revitalised Chelsea as a Premier League and European force when he took on the reins at Stamford Bridge in 2004, and his reputation as one of football's best - and charismatic - coaches has remained.
But why is the Portuguese manager called 'The Special One'? Goal takes a look.
Why is Jose Mourinho called 'The Special One'?
Mourinho's famed moniker dates back to when he arrived at Chelsea for his first spell at Stamford Bridge in 2004, telling reporters in his inaugural press conference that he thought of himself as a "special one" - which has stuck with him in the years since.