What must a referee ensure before issuing a second yellow card to a player?

Before issuing a second yellow card to a player, it is essential for the referee to inform the player of the infraction that led to the second yellow card and the consequence of that infraction, which is a red card dismissal. This step is crucial because it upholds the principles of fair play and ensures that the player understands the reason for the disciplinary action being taken against them. Clear communication helps maintain the integrity of the game and ensures that players are aware of their actions and the rules they are expected to follow.

Other options do not meet this critical requirement. While warning a player multiple times or ensuring they receive medical attention might be relevant in certain game situations, they are not prerequisites for issuing a second yellow card. Similarly, the act of subbing the player out is not necessary before a card is issued, as the procedure for carding a player occurs during active play and does not require them to leave the field at that moment.