Kurt Zouma has a pop from range but slices the ball high and wide into the stand behind the goal. Cue more mocking cheers.

Image source, Reuters

Sam Kier: It's crazy how much weaker Chelsea look without Kante on the pitch - signing of the season by a mile!

Sho Rahman: Costa has Pedro on toast. Pedro has never been a left wing back. 

Chelsea with a corner. They take it short and work it to Pedro outside the box but his low shot is weak and bobbles wide of the target, to huge cheers from the home crowd, who are still aggrieved at Hazard's little bit of play acting.

Eden Hazard buys his team a free-kick wide on the left. He has made the absolute most of a challenge from Conor Coady - a fair challenge I might add.

Fabregas floats the ball into the box but a Wolves head clears.

Image source, Rex Features

Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live

It is a really good atmosphere at Molineux.

The home supporters have done everything right. They have pushed the league aside and turned up fresh-faced for this cup tie and got behind their team from the very first whistle.

The Wolves fans believe. They are in full voice as their team come forward again for an attack that is ended by David Edwards' loose pass.

Chelsea look uncharacteristically uncomfortable at times. They've invited pressure on themselves with stupid mistakes. Wolves, for their part, are obviously well up for the fight.

Image source, Reuters

The free-kick is delivered well but under a lot of pressure Nathan Ake does well to head clear. Wolves come again, though, and Chelsea are lucky that Jon Dadi Bodvarsson's cross falls into space in the box and not to a team-mate.

Pedro into the book for a lunging tackle on Helder Costa. It gives Wolves a potentially dangerous free-kick on the right.

Image source, Getty Images

Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live

Wolves have started dead right again, they have come flying out of the blocks and penning the Chelsea players in their own 18 yard box and forcing mistakes.

Wolves have rattled them and they need to take full advantage when a chance falls their way.

Another upset will be on the cards.

Wolves start the second half as they started the first. Helder Costa drives to the byline and crosses low but his delivery is cut out.

Image source, Getty Images

We are back under way. Plenty of promise in that first half. Be nice to have some end product in the second.

TV personality Mark Wright remembers his beloved West Ham suffering FA Cup heartbreak in the 1993-94 campaign when they lost 3-2 against Luton in a sixth-round replay, as part of BBC Sport's No Guts, No Glory campaign.

Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live

Wolves have been very good. 

I was impressed with how they started the game. 

They have been brave, had genuine quality, put the ball in the Chelsea box and worried them but threat of Chelsea is never too far away.

Image source, Getty Images

The half ends with a Wolves corner that is headed away at the near post by Cesc Fabregas.

Really entertaining stuff at Molineux. The Championship side have hit the post and have arguably edged it. Chelsea look dangerous going forward but not quite at their sharpest.

Chance! Victor Moses drives at Andreas Wiemann down the right and whips over a pacy cross that Diego Costa adjusts well to, to wrap a boot around but flick a shot over the bar.

Wolves ending the half on a high. A nice break from David Edwards sets up a brief period of pressure that Chelsea have to stay vigilant to see off.

Three minutes left in the half. Wolves are giving a good account of themselves against the Premier League leaders.

Image source, Reuters

Andy Townsend
Ex-Republic of Ireland international on BBC Radio 5 live

Zouma is not the most comfortable on the right side of the three defenders. 

He is better when he is up against someone dealing with them and marking them.

Image source, Getty Images

Chelsea are so quick on the counter. Willian and Eden Hazard dart away following a clearing header from a cross. The latter lets the side down, though, with a poor pass that gives his team-mate no chance of retaining possession.