The use of VAR caused huge controversy during Chelsea's FA Cup win over Norwich, so is the technology good or bad for football?
One of the biggest talking points in football this season has been the use of VAR (video assistant referee).
Having been utilised in the Confederations Cup last summer, as well as a number of international tournaments, such as the FIFA Under-20 World Cup, VAR was introduced this season in several major European competitions, including Italy's Serie A, Germany's Bundesliga and England's FA Cup.
However, the new system has sparked a lot of controversy in all three countries and Chelsea manager Antonio Conte went on a lengthy tirade on Wednesday night following his side's FA Cup win over Norwich, after Willian was denied what appeared to be a penalty in extra time, and then booked for simulation.