Watch: Derby goal disallowed by VAR for offsidepublished at 20:43 GMT 16 January 2019
Make your own minds up...
Summary
Watch game on BBC One and listen on BBC Radio 5 live
Keogh scores winning spot-kick to set up tie with Accrington in round four
Saints led 2-0 through Armstrong and Redmond strikes
Wilson free-kick reduces the deficit before Waghorn heads in
Derby's Bryson earlier had finish ruled out by VAR for narrow offside call
Watch: Derby goal disallowed by VAR for offsidepublished at 20:43 GMT 16 January 2019
Postpublished at 20:42 GMT 16 January 2019
Southampton 0-0 Derby
Jermaine Jenas
Former England and Tottenham midfielder on BBC OneIf you draw a line down from Vestergaard's shoulder it would fall right in line with Waghorn's foot.
The goal at Newcastle last night was a yard offside but this - the goal has to stand.
Fancy a trip to the FA Cup final?published at 20:39 GMT 16 January 2019
#FAPeoplesCup
The teams playing tonight are hoping ultimately to get to the FA Cup final in May - and YOU can too!
The FA People's Cup gives you the chance to play at St George's Park and appear on the Wembley turf during the FA Cup final in May.
Here's Alex Scott to explain...
Media caption, Register now for the 2019 FA People's Cup!
So what are you waiting for? Find out more about the competition and how to sign up here.
VAR will get fasterpublished at 20:39 GMT 16 January 2019
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End of X postget involved Get Involvedpublished at 20:38 GMT 16 January 2019
#bbcfootball or 81111 on text (UK only)
Patrick O'Hara: VAR should only be used when everyone in the competition has it. it has shown in other games in the F A Cup goals were offside etc , but teams did not benefit from VAR, either everyone uses it or no one uses it when you are in the same competiton
Jackabout: Danny Murphy is clueless about VAR - clear and obvious doesn't come into it when it's offside, it's either offside or it's not and it was
Your chance at football glory!published at 20:37 GMT 16 January 2019
#FAPeoplesCup
Fancy a flavour of the FA Cup yourself?
You can with the FA People's Cup - the nation's biggest five-a-side football competition.
It's free, fun, and open to women, men and those with disabilities, like this lot...
Media caption, 2019 FA People's Cup: Free five-a-side tournament open to entries
Find out more about the competition and how to sign up here.
'VAR wasn't brought in for this'published at 20:36 GMT 16 January 2019
Southampton 0-0 Derby
Alan Shearer
Former England captain on BBC OneWe can't tell if that's offside at all, we've been looking at it for five or six minutes now. We are talking about millimetres. VAR wasn't brought in for this.
If they can't make a decision after watching a replay two or three times then it it is not obvious. Derby have been very hard done by.
Postpublished at 20:35 GMT 16 January 2019
Here's what Shearer and Jenas had to say about the Marcelo Bielsa 'spy' affair.
Media caption, Spygate: MOTD pundits discuss Marcelo Bielsa and Leeds spying
HALF-TIMEpublished at 20:34 GMT 16 January 2019
Southampton 0-0 Derby
VAR ruled out a goal for Derby, they were the better side in that half as the game wore on.
Postpublished at 20:34 GMT 16 January 2019
Southampton 0-0 Derby
Danny Murphy
Former Liverpool and England midfielder on BBC OneAnd why did the referee decide to take the players all the way back for the kick-off? He could have waited where they were. I don't understand it.
Image source, ReutersPostpublished at 45+2 mins
Southampton 0-0 Derby
Shane Long is back on the pitch but he doesn't look right to me. Limping.
'We'll be reviewing every goal'published at 20:32 GMT 16 January 2019
Southampton 0-0 Derby
Danny Murphy
Former Liverpool and England midfielder on BBC OneI worry for the fact that for the tiny fractions we're talking about, we're going to be reviewing every goal.
The reason I went to football was for that moment the goal goes in, that buzz. The first time I was on the Kop and Liverpool scored it was one of the most memorable moments of my life.
What you going to do now? Think 'I won't celebrate yet until the VAR's been'?
I has to be used at the right time.
Postpublished at 45 mins
Southampton 0-0 Derby
Shane Long is down and needs treatment after Derby defender Fikayo Tomori lands on his ankle.
The Saints have lost a few strikers of late...
Postpublished at 45 mins
Southampton 0-0 Derby
There was two minutes and two seconds between the ball hitting the net and the 'goal' being ruled out.
Watch: Mount blazes over following 'the move of the match'published at 20:28 GMT 16 January 2019
Southampton 0-0 Derby
It remains goalless then. I'll show you that disallowed goal as soon as I can but in the meantime here's some liquid football from the Rams followed by a wild finish...
'That was tedious'published at 20:27 GMT 16 January 2019
Southampton 0-0 Derby
Danny Murphy
Former Liverpool and England midfielder on BBC OneWe were waiting around too long for that. It's not clear and obvious - it's half a shoe size.
That was tedious and not the right way we should be watching a football match. But you could argue the right decision has come in the end.
Image source, AFPDISALLOWED GOALpublished at 40 mins
Southampton 0-0 Derby
Ruled out by VAR!
My word that is tight. Martyn Waghorn's big toe is maybe offside as he played the ball into the path of Craig Bryson.
Clear and obvious error?
It still looks pretty level to me...
Whatever - the goal does NOT stand...
GOAL - Southampton 0-1 Derbypublished at 39 mins
Craig Bryson
That is a cracking goal!
Pass and move, great movement, it had all the hallmarks of what Derby had shown so far. The ball is fizzed into the run of Martyn Waghorn by Mason Mount, Craig Bryson steps over the ball and Waghorn then finds Bryson running back into the area and he finishes low and hard!
Fine goal.
Hang on...
Image source, ReutersPostpublished at 37 mins
Southampton 0-0 Derby
A weary groan rings out from the stands as Shane Long takes a poor touch and ends a decent looking attack for the hosts. James Ward-Prowse moved through the gears and through the middle of the pitch but Long lost it.
Derby then attack and can't quite get the ball out of Jack Marriott's feet.
Postpublished at 20:20 GMT 16 January 2019
Southampton 0-0 Derby
Danny Murphy
Former Liverpool and England midfielder on BBC OneIt was good play again by Derby. They've had a good 10 minutes and played some good football. Southampton are struggling to implement themselves.