When the La Liga season opens on Friday, one of the biggest storylines will be the use of video assistant replay (VAR) for the first time.

Carlos Velasco, president of the Referee Technical Committee, believes VAR will only be a positive and help referees avoid game-altering mistakes.

“Every referee’s nightmare when refereeing a World Cup is that a team goes through because of you, or that a team is knocked out because of you,” said Velasco.

See what else Velasco had to say in the video below.