Some players manage to go their entire careers without ever getting into the referees' bad books, while others see either yellow or red on almost a weekly basis.
These are the Premier League's bad boys - players who love a tackle and live for confrontation.
A few players on this list accumulated so many red and yellow cards throughout their careers due to mistimed tackles and recklessness rather than a burning desire to inflict some damage on their opponents.
Sadly, though, this doesn't apply to all of them.
Click next to see the ten dirtiest players of the Premier League era - with all stats provided by transfermarkt.