The Blues, 1-0 up thanks to a close range effort by striker Michy Batshuayi in the second half were pegged back in the 94th minute of regulation time to send the 3rd round replay into extra time.
At the DW Stadium, third-tier Wigan, who won the FA Cup in 2013, brushed aside under-strength Bournemouth in their third round replay.
While Pedro was guilty of an obvious dive in the second half, and could have no complaints about his subsequent red for bringing down Wes Hoolahan, the other decisions were not so clear cut. Ref and VAR have failed to spot at least 1 very clear & a probable second penalty for Chelsea.
If we want to try to use this new system, it is important for the referee to wait, especially in this incident that is not so clear.
"For me, this is not the right solution if the referee doesn't refer a doubtful decision". Who on earth is looking at that screen and doesn't think it is a penalty?
"I hope this wasn't a referee (as VAR)".
On BBC One, Alan Shearer called Willian's yellow card a "shocking decision" and the failure of the video assistant to correct it a "shambles". You must pay great attention because in this moment in the game you have to stay calm'.
"He's shown me he is ready to play with the right concentration and be ready physically and tactically to play at this level".More news: Google partners with Tencent to develop future technologies
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"I didn't watch the scenes back and I don't want to judge it at all".
"The manager said the formation the team plays is ideal for me, so now I've got to train well and perform well to be in the team", Barkley said in Chelsea's matchday programme. 'I am not a fan.
'If it wasn't for VAR tonight, we'd be talking about it maybe being a penalty. I like more the traditional game and when football is simple.
Swansea City, the Premier League's bottom team, also reached the fourth round with Wilfried Bony grabbing the victor in a 2-1 victory over Championship leaders Wolverhampton Wanderers but it was a grim night for the top flight's Bournemouth as they were dumped out after an embarrassing 3-0 replay defeat at third tier Wigan Athletic.
"And then when the referee that is watching had a doubt, he has to call the referee to watch and he can make a decision". He was going to shoot and probably score'.
It appeared that Scott opted not to use VAR, which would have shown contact was made with Willian.
The Blues and Canaries played out a testing 0-0 draw at Carrow Road 11 days ago and will hopefully serve up a better contest in west London than they did in east Anglia, though Daniel Farke's men have been weakened in the days between the initial tie and the replay; Norwich have seen Alex Pritchard, Yanic Wildschut and Cameron Jerome all leave for pastures new.