Introduction of Cards (Recommended)
Yellow Card (Caution)
Player, in the opinion of the Referee, is persistently infringing on the Laws of the Game but may continue to stay in the game.
Red Card (Ejection)
Player, in the opinion of the Referee, is guilty of violent or serious foul, using foul or abusive language, persists in misconduct after having received a caution, and may no longer participate in the game. The ejected player cannot be replaced by a substitute.