New red card rule allows referees to send off players who cover their mouths or walk off the pitch in protest against a decision.
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Footballers covering their mouths during a confrontation with an opponent or any other player on the pitch will be given a red card under a new rule approved by the International Football Association Board (IFAB).
The board held a special meeting in Vancouver on Tuesday to pass FIFA-approved amendments to address inappropriate behaviour ahead of the World Cup in North America.
