Norwich City’s Emirates FA Cup third round replay at Stamford Bridge will use Video Assistant Referees.
VAR was used for the first time in a competitive club match in England during last week's FA Cup match between Brighton and Crystal Palace, and has since been used in the first legs of the Carabao Cup semi-finals and televised FA Cup games.
Video officials and other match officials are able to recommend reviews, but only the referee is able to initiate a review by drawing the outline of a TV screen in the air. The referee, who can review the footage on a pitch-side monitor, will then make the final decision on whether their original decision should be changed.
The system was used in both the Fifa Under-20 World Cup and Confederations Cup last summer after a two-year trial period was approved by the International Football Association Board. It is widely used in Italy’s Serie A, the German Bundesliga and Major League Soccer in America.
It is there to “correct clear errors and for missed serious incidents” in “match-changing” incidents. These incidents include goal, penalty decisions, red cards and mistaken identity.