Spitting, racial abuse, motoring offences, taunting an injured player, and numerous red cards - although Diouf has no crowning moment of controversy to eclipse his others, the sheer length and variety of his rap sheet surely merits inclusion on this list. During his time with Liverpool, Bolton, Blackburn and Sunderland, he drew the ire of opposition (and often his own) supporters thanks to his consistently disrespectful behaviour and unrepentant attitude.