Manchester United defender Rio Ferdinand insists Premier League players are fully aware of the rules when it comes to two-footed tackles and believes there is no room for argument over the matter.
The sending off of Vincent Kompany in last Sunday's FA Cup derby sparked a debate about the use of two-footed tackles in the game - as the Manchester City captain won the ball in the challenge on Nani.
City manager Roberto Mancini was been left fuming at the decision and the club appealed against Kompany's subsequent four-match ban.
But the appeal was thrown out by the FA, something Ferdinand feels was inevitable as players know to expect a red card if they tackle with two feet, regardless of whether they come away with the ball or not.
"I don't understand why this debate is still going on,'' Ferdinand said. "It's stated clearly in the rule book, we get told before the season when all the referees go around the different clubs: a two-footed tackle is a red card.
"It's as simple as that. It baffles me that there's any argument or debate around the issue.''