What action should be taken if a goalkeeper lunges off the goal line before a penalty kick is taken?

When a goalkeeper lunges off the goal line before a penalty kick is taken, the appropriate action is to caution the goalkeeper. This is because the Laws of the Game require the goalkeeper to remain on the goal line, between the goalposts, until the ball is kicked. If the goalkeeper moves off the line prematurely, it constitutes a violation of these rules, specifically concerning the conduct expected during a penalty situation.

Cautioning the goalkeeper serves as a formal reprimand for their infringement and highlights the importance of adhering to the rules during such critical moments in the game. It reinforces the need for goalkeepers to maintain their position until the penalty kick is taken, thus ensuring fair play and upholding the integrity of the match.