Antonio Conte said the Video Assistant Referee system must improve after a “big mistake” in Chelsea’s FA Cup penalty shoot-out win over Norwich on Wednesday.
In an incident-packed game, there was confusion on several occasions as Chelsea had penalty appeals waved away by referee Graham Scott.
Pedro, Alvaro Morata and Willian were all booked for diving in the box and it was unclear whether Scott referred any of the decisions to the VAR.
Pedro and Morata were also sent off in extra-time, but Chelsea head coach Conte was particularly frustrated by the decision not to award a penalty for a foul on Willian.
“I think that we need to improve if we want to use this new system,” Conte said. “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 per cent, then OK it’s simulation book him.”