Chelsea manager Antonio Conte has insisted that the only way VAR will be accepted in English football is if 'big mistakes' are eradicated.
The system, rolled out in domestic cup competitions for the first time earlier this month, has once again been questioned following the Blues' action-packed third-round replay with Norwich City in the FA Cup.
Amid all the confusion it remains unclear whether Scott referred any of the decisions to the VAR, and Conte claims that the system has serious flaws.
"I think that we need to improve if we want to use this new system," he told reporters after the match. "Today in this game there is a very clear situation with Willian. I think the situation was very clear and I watched and it's a penalty, very clear. The referee quickly took a decision to book Willian. It means you don't have doubt.
"If we want to improve this new system you have to wait to check with the person that is watching the game and then if this person is sure, 100%, then OK it's simulation book him. The person that is watching the game must have a doubt because there is a kick to Willian, and in this case you have to call the referee and tell him there is a doubt, maybe it's not a penalty, but it's better if you go watch the decision.
"The Willian penalty was a big mistake. Not for the referee on the pitch, but the person watching the game, if you are watching and don't see that situation...he must improve. To avoid a big mistake you have to call the referee and tell him: 'maybe this situation, there is a doubt, for me it's no penalty but it's better you go watch and then make the decision'.
"We have to respect the referee on the pitch and he has to make the final decision, not another person saying they are 100 per cent sure and don't call the referee. The referee watches and then makes the best decision. You must be sure 100%. There is another person checking and if they call and say it's a penalty you give a penalty and say it's a mistake and no yellow card. We have to find the solution."
VAR, successfully used 24 hours beforehand in Leicester City's 2-0 win over Fleetwood Town, will next be in use during next week's EFL Cup semi-final between Arsenal and Chelsea.