4) Roy Keane
He may be a Manchester United legend, but the Irish hard-man was never particularly gifted when it came to steering clear of controversy.
He was sent home in disgrace by international manager Mick McCarthy shortly before the 2002 World Cup, while his fierce rivalry with Arsenal captain Patrick Vieira became a phenomenon.
In his autobiography, he admitted that he intended to hurt Manchester City player Alf-Inge Haland with a bad tackle, earning him a five match ban and a £150,000 fine on top of his original suspension.
