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FT: Nottingham Forest 1-1 Bristol City - Origi opens scoring & Knight levels, before hosts win 5-3 on penalties
Forest will now host Man Utd
FT: Aston Villa 1-3 Chelsea - Gallagher opens scoring & Jackson doubles lead before superb Fernandez free-kick; Diaby pulls one back
Chelsea will host Leeds United next
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Aston Villa 0-2 Chelsea
Dion Dublin
Former England striker on BBC Radio 5 Live
That's incredible from Chelsea. Just that change in formation they are overloading the midfield and just starting to win the ball back higher up.
That is a fantastic cross and Jackson is where any good centre-forward should be. What a header, what a break, at the moment, Chelsea are on fire.
Nicolas Jackson
Forget Maidstone United. A huge FA Cup shock is brewing at Villa Park.
There's around 7,000 Chelsea fans inside Villa Park and they're going crackers as Nicolas Jackson doubles the lead with a header.
A decent assist by Malo Gusto too.
Image source, Getty ImagesAston Villa 0-1 Chelsea
Dion Dublin
Former England striker on BBC Radio 5 Live
Fernandez now is just starting to get a feel of this game and Gallagher as well and Caicedo is getting tackles in.
Cole Palmer is warming too, so Chelsea are just starting to cause Villa some problems.
Image source, Getty ImagesAston Villa 0-1 Chelsea
What's happened to Chelsea? They look a very different team to the one turned over by Liverpool and Wolves in the past week.
Noni Madueke drives at the Villa defence but cannot finish.
Much, much better by Chelsea after recent poor performances.
Aston Villa 0-1 Chelsea
Dion Dublin
Former England striker on BBC Radio 5 Live
It is a great game at the moment. Both sides are really going for it.
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Amazing that in Gallagher Chelsea were rumoured to want to sell their second most consistent performer.
Tony
Nottingham Forest 1-1 Bristol City
Bristol City look dangerous each time they pour forward.
Tommy Conway is the latest to test Matt Turner who does well to beat his fierce low drive away.
Image source, ReutersAston Villa 0-1 Chelsea
Phil McNulty
BBC Sport chief football writer at Villa Park
Chelsea’s fans were chanting the name of former owner Roman Abramovich in the ninth minute then seconds later Conor Gallagher gave them a goal to cheer instead.
Crisp move and right-foot finish in front of the Holte End. Big noise from the Chelsea section now. Villa supporters stunned after such a bright start by Unai Emery’s side.
Aston Villa 0-1 Chelsea
Dion Dublin
Former England striker on BBC Radio 5 Live
I think it was Kamara who gave the ball away. Nice hold-up play from Noni Madueke and he rolls it back to Gallagher.
It is an easy side-foot from Gallagher. Now they are on the same page.
Image source, Getty ImagesConor Gallagher
What crisis?
That's a lovely finish by Conor Gallagher after Noni Madueke's pass. It's cool and composed - and it sends Chelsea into the lead.
Chelsea's travelling fans have not had a lot to celebrate lately but they're determined to enjoy that moment.
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Andrew: Here we go. Forest cannot keep a clean sheet or hold onto a lead. Super frustrating as a fan.
Nottingham Forest 1-1 Bristol City
Bristol City look ever so comfortable at the City Ground. The Championship club are pinging it around with confidence. They've been excellent since conceding.
Image source, PA MediaAston Villa 0-0 Chelsea
Signs of encouragement for Mauricio Pochettino.
A neat move by Chelsea ends with Noni Madueke finding Cole Palmer but the young forward cannot provide the finish.
Aston Villa 0-0 Chelsea
Dion Dublin
Former England striker on BBC Radio 5 Live
Villa, at the moment, are opening up Chelsea like it's an everyday thing.
Aston Villa 0-0 Chelsea
Both teams are still finding their feet. Matty Cash delivers a decent cross into the box but Villa cannot make it count. There's a terrific atmosphere under the lights at Villa Park.
Nottingham Forest 1-1 Bristol City
Michael Brown
Former Tottenham midfielder on BBC Radio 5 Live
Wonderful strike right into the top corner. Turner might be disappointed but that is a brilliant finish.
Image source, ReutersAston Villa 0-0 Chelsea
Under way at a raucous Villa Park.
What a tie!
Superb response by Bristol City as they get themselves back on level terms.
Skipper Jason Knight prods home after an assist by Haydon Roberts.
The Championship club are being backed by a few thousand travelling fans and they're making all the noise.
Image source, Getty ImagesNottingham Forest 1-0 Bristol City
Decent response by the Championship club since going behind. Sam Bell forces Matt Turner into his first serious save.
Aston Villa v Chelsea (20:00 GMT)
Nedum Onuoha
Former Manchester City defender on the Football Daily podcast
Chelsea aren't in a great spot. We have seen them be successful and seen them do well but we know their team isn't performing to its absolute best because if they were, maybe they would accept some of the negative results.