What happens if a player leaves the field of play without the referee's consent?

When a player leaves the field of play without the referee's consent, they can be cautioned with a yellow card. This action is significant because it underscores the importance of adhering to the rules regarding player conduct and the authority of the referee during a match. The referee has control over the game and the players, and leaving the field without permission is considered unsporting behavior.

In this context, issuing a yellow card serves as a disciplinary measure aimed at maintaining respect for the rules and the game itself. It communicates to the player and their teammates that following the referee's directions is crucial for the proper conduct of the match.

Other options do not accurately reflect the consequences of a player leaving the field without consent. A player is not immediately substituted in this scenario, nor do they receive a penalty kick as a result of this action, nor are they required to sit out for the remainder of the match.