Three main incidents (plus one administrative) have been identified as game-changing.

Goals The role of the VAR is to assist the referee to determine whether there was an infringement that means a goal should not be awarded. As the ball has crossed the line, play is interrupted so there is no direct impact on the game.

Penalty decisions The role of the VAR is to ensure that no clearly wrong decisions are made in conjunction with the award or non-award of a penalty kick.

Direct red card incidents The role of the VAR is to ensure that no clearly wrong decisions are made in conjunction with sending off or not sending off a player.