Pierluigi Collina, the world's most famous referee and the man in charge of the first round clash between England and Argentina, has vowed to crack down on cheating during the World Cup.
He explained: "The recommendation we received from Fifa is to be very careful about diving because it's very, very difficult on the field to distinguish some situations."
Collina confirmed that that means simulation, or diving, in any part of the field will automatically lead to a yellow card.
But the man voted the best referee in the world four times refused to be drawn on whether some countries have a reputation for diving, or if cheating is widespread.
Tough but fair
In an interview for BBC HARDtalk he said: "Referees know the players from all over the world. We cannot start the match knowing and being sure about the behaviour of players.
"I cannot take a wrong decision only because of the reputation of the player."
In March this year Collina attended a Fifa seminar in Seoul where officials were briefed that cheating, especially diving and drug taking, will be clamped down on during the tournament.
He said: "I have to be careful if I know what could happen; my assessment has to be correct and fair."
Collinga was voted referee of the tournament at Euro 2000 and refereed England's 5-1 victory over Germany last September.
He went on to speak about his attitude to refereeing, and the relationship between the player and referee.
He said: "We cannot consider ourselves as enemies because we are involved in the same sport."
"I think it is very important that everyone involved in the show, because football is also a show, understands what is happening and even what decision the referee took."
And he admitted that his fearsome stare, for which he is famous, could help get the message across.