Dion Dublin
Former England striker on BBC Radio 5 Live

I think this is a blip for Villa.

I don't think this will affect them going forward. I think it was an off-day for Villa and Chelsea were brilliant.

This is pretty much being played at walking pace at times. Both sets of players have run themselves into the ground.

Dion Dublin
Former England striker on BBC Radio 5 Live

Chelsea were outstanding. Villa started on fire and Chelsea didn't know what to do but then Chelsea took control.

They were dominant in every department. The quality that Chelsea have had for a very long time reared its head tonight and I didn't expect it.

I feel like they have hit a standard of football that if they keep that going, wow, they'll be some side.

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Away we go!

Fifteen minutes to go. Will penalties decide who hosts Manchester United in the fifth round?

And still they play on at the City Ground where they are approaching the end of the first half of extra time. Enormous credit to Bristol City. They have caused their Premier League hosts loads of problems.

A great night for Chelsea and their 7,000 travelling fans. Mauricio Pochettino's side will host Leeds in the fifth round.

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Almost a fourth for Chelsea!

Moises Caicedo gets behind the Villa defence but he cannot beat Emi Martinez who makes a fine save.

A late surge by Villa. Substitute Tim Iroegbunam with a header but it lacks power.

Too little, too late.

Four additional minutes. Chelsea are almost there.

This is a worrying sight for Mauricio Pochettino. Benoît Badiashile is limping and that looks like his night is over.

Harry Cornick with an ambitious curling attempt from outside the box. The Bristol City substitute gets it all wrong.

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Usman: It took Poch over half the season and so many missed chances and abysmal performances to drop Sterling. Poch isn't good enough but I think that gives him until the Carabao Cup final.

Arron: Poch is out of his depth! Players are average and overpaid bumbling towards mid-table mediocrity! I couldn't be happier.

Anon: I wish i could, but one game cant be a decider. There is need for consistence and team balance. Benching Sterling today proves a point.

The Championship club get extra time under way.

Michael Brown
Former Tottenham midfielder on BBC Radio 5 Live

Forest should be able to come through this. As the game goes on longer and longer they should be able to.

But Bristol City seem to have an understanding and a belief.

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Chelsea fans are singing about Wembley. Some Villa fans have seen enough and are heading home with nine or so minutes of normal time left.

Chelsea make a change. Thiago Silva is among those coming on. Cole Palmer has made way.

An additional 30 minutes required to discover who faces Manchester United.