Mike Dean has admitted he was 'nervous and scared' of refereeing 'big personality players' like Roy Keane and Patrick Vieira when he first became a Premier League official.
Dean started his career as a top-flight referee in 2000 and has gone on to take charge of 553 Premier League matches, handing out 114 red cards - more than any other official.
He announced last week he will retire at the end of this season after 22 years refereeing at the highest level, with speculation rife about where his future lies off the field.