Chelsea manager Antonio Conte said the video assistant referee system must be improved after his side's controversial penalty shoot-out win over Norwich in their FA Cup third-round replay.
Chelsea prevailed 5-3 on penalties after a 1-1 draw, but finished the match with nine men having had three players booked for simulation, with Pedro and Alvaro Morata subsequently receiving second yellow cards, Morata for his furious response to being booked.
The decision to book Willian provoked the most controversy as he was clearly clipped by Timm Klose, but there was no apparent referral to the VAR, with referee Graham Scott appearing to rule Willian was already on his way down when the contact occurred.