Under Law 12 of the IFAB Laws of the Game, the The offence committed by Marco Verratti is mentioned under Section 3: Disciplinary ActionLaw 12 - Fouls and Misconduct, Section 3: Disciplinary Action.
Cautions for unsporting behaviour
There are different circumstances when a player must be cautioned for unsporting behaviour including if a player:
- uses a deliberate trick to pass the ball (including from a free kick) to the goalkeeper with the head, chest, knee etc. to circumvent the Law, whether or not the goalkeeper touches the ball with the hands.
Going down under no pressure to head the ball to the keeper certainly fits the act that this rule aims to punish and although the referee has drawn flak for brandishing the yellow card, he has followed the rule and taken appropriate action for Verratti's offence.