RED AND YELLOW CARDS
Can a VAR review ever lead to a yellow card?
VAR cannot review a yellow card, but it can lead to one. For instance, if a player has deceived the referee to win a penalty the referee may book him for diving after the penalty review. Also, any player who excessively appeals for the use of VAR -- including substitutes -- can be cautioned.
Can a player get a yellow card following a red card review?
A review for a direct red card can result in a yellow card. For example, if there is a review for a high tackle that the VAR believes could be a red card, the referee could decide it is only worth yellow. The correct disciplinary action should always be applied once the referee has visited the review area.
Can a red card be rescinded as well as shown?
If the VAR advises that a player should not have been sent off, the sanction can be downgraded to a yellow or rescinded entirely.