No, they don't! The referee blows the final whistle and West Ham are through to the quarter-finals!
90' +4
G. Cahill has scored a goal for Chelsea! Assist by César Azpilicueta.
C. Kouyaté gets yellow.
Azpilicueta also goes into the book for Chelsea.
CHELSEA SCORE!!! They deserve that in all fairness! Willian's free-kick bounces around the area before Cahill eventually blasts home what will surely be a consolation for the Blues. It is unlikely that they will have time after the kick-off...
Kouyaté has his name taken for a rash challenge.
90' +2
GREAT SAVE! West Ham almost finish with a flourish as they break on the counter attack. Zaza races away before squaring the ball to Payet, whose shot is brilliantly turned away by Begovic.
90' +1
We are into the first of four additional minutes at the end of this game. There is trouble breaking out in the stands behind the West Ham goal. It has been a brilliant match at the London Stadium and should not be spoiled by a minority of fans.
89'
WHY DIDN'T HAZARD SHOOT! The Belgian gets in behind the defence as he latches onto a neat through ball but, rather than shoot, looks to cut inside and it runs away from him. He goes down with a half-hearted penalty appeal but Mr Pawson remains unmoved.
88'
The Blues continue to knock on the door in the hope of a late rally. Willian's free-kick is met by the head of Terry, but the ball drifts wide of the far post.
85'
ONE OF THOSE NIGHTS! It just hasn't happened for Chelsea here. Costa shows great movement to lose Ogbonna and latch onto Willian's through ball, but can only scoop wide of the target with just Randolph to beat.
83'
GREAT CHANCE! West Ham look to kill the game off with Cresswell and Payet combining down the left flank. The Frenchman whips in a deep cross that is met by Ayew, but he can only head wide of the target with only Begovic to beat.
82'
S. Zaza enters the game and replaces M. Antonio.
Bilic makes his final change and Antonio is given a well-earned rest, as he is replaced by Simone Zaza.
81'
OFF THE BAR! Chelsea starting to turn up the pressure inside the final 10 minutes. First, Cahill's cross is just about dealt with by the hosts, before Hazard's shot from Costa's through ball rattles the crossbar.
Minute
Description
78'
A. Ayew enters the game and replaces M. Lanzini.
Andre Ayew makes his return from the injury he suffered against Chelsea on his debut two months ago. Lanzini is the player to make way.
76'
W. Reid gets yellow.
Reid is rather harshly booked for an apparent foul on Costa. Replays show that the striker tripped over the ball on his own accord. Justice is done, though, when Luiz blasts the free-kick straight into the wall.
74'
WHAT A WASTE! Costa springs the offside trap by timing his run to perfection to latch onto a long ball. He then shows great awareness to pull the ball back for Willian, but the Brazilian can only scuff an effort wide of the far post.
71'
Feghouli is looking eager to make an impact as he puts in a couple of strong challenges shortly after his introduction. The West Ham fans respond to his efforts and they will be delighted with their side's performance so far.
69'
All of the big guns are on for Chelsea now. Can they make a difference and turn this match on its head? They have just over 20 minutes to do so...
67'
Pedro enters the game and replaces O. Aina.
Meanwhile, Conte makes his final change. Pedro is the final throw of the dice, as he replaces Aina.
66'
S. Féghouli enters the game and replaces E. Fernandes.
West Ham make their first change as Fernandes makes way to be replaced by Sofiane Feghouli.
West Ham almost put the game to bed after a wonderful move sees Lanzini release Payet in behind the defence. However, a vital intervention saves Chelsea on his occasion.
64'
M. Noble gets yellow.
Hazard is involved straight away as he is brought down by Noble, who receives the first yellow card of the game.
63'
E. Hazard enters the game and replaces N. Chalobah.
The big guns are being slung into the action by Conte. Eden Hazard is the next to be introduced with Chalobah making way.
60'
The home supporters are chuckling at Costa's expense once again, as he is not awarded a free-kick after going down too easily under the challenge of Reid. Referee Craig Pawson signals for a throw-in instead.
58'
The Brazilian-born striker is involved immediately as he looks to connect with Luiz's clever dink into the box. He is unable to stretch far enough, however, much to the amusement of the West Ham fans.
56'
Costa scored the winner in the league meeting between the two sides on August 15 and the Spain international will be looking to make a similar impact here.
54'
Diego Costa enters the game and replaces M. Batshuayi.
Conte has decided it is time to introduce Diego Costa into the action. Batshuayi makes way after a disappointing day for the Belgian.
53'
JUST WIDE! Payet leads the charge as West Ham look to hit Chelsea on the counter. He finds Antonio, who skips away from a couple of challenges before using good strength to hold off challenges. He lays it off for Noble, whose drilled effort bounces just past the far post.
50'
Chelsea look to respond immediately with a swift break down the right flank. However, the ball into the area is easily dealt with by West Ham.
48'
E. Fernandes has scored a goal for West Ham United! Assist by M. Noble.
GREAT STRIKE - 2-0 TO WEST HAM!!! Fernandes doubles the lead in fine style! Begovic initially spreads himself brilliantly to deny Payet. The reprieve is short-lived, though, as Noble finds Fernandes out wide and the Swiss winger drifts inside, before drilling into the bottom corner beyond the dive of Begovic.
46'
KICK-OFF! The referee blows his whistle and West Ham get the ball rolling once more.
45' +2
NOT FAR AWAY! The visitors look to level before the break. Oscar gets a shot away that is deflected just wide of the target. The resulting corner comes to nothing as Randolph is fouled and the referee blows for half-time.
45'
WHAT A MISS! Chelsea should be level! A quickfire counter attack from the Blues sees Oscar play a first-time ball across the area for an unmarked Batshuayi, who fires over the bar from 12 yards out and with just Randolph to beat.
43'
THUNDEROUS STRIKE! West Ham go close to doubling the lead! An initial ball into the box is cleared but only as far as Obiang, who unleashes a speed-of-light drive that has to be beaten away by an alert Begovic.
41'
It promises to be a good second half if the first is anything to go by. Both teams have looked very strong inside the opening 45 minutes and will be hoping for more of the same after the break.
39'
Lanzini launches a dangerous counter attack for West Ham with a strong run down the left flank. The ball gets played to the edge of the box for Antonio, who tries to thread it through for a team mate. However, Chelsea are alert to the danger and able to clear.
37'
VITAL SAVE! Antonio is causing all sorts of problems for Chelsea when West Ham are on the attack. He draws a free-kick out of Terry, from which Payet goes for goal. The angle is tight but Begovic is all full stretch as he pushes it away to safety.
34'
Chelsea are over-complicating things too much at the moment. Whenever the Blues get into good positions, it looks like they are trying to walk the ball into the net. The visitors do get a shot away through Batshuayi, but it is well held by Randolph.
31'
WHAT A CHANCE! Out of nowhere, West Ham get in behind the Chelsea defence after a clever turn from Antonio. The Englishman drives into the area and pulls the ball back for Lanzini, who can only direct his effort wide of the target. That was a fantastic opportunity for 2-0 and Bilic will be hoping that does not come back to haunt his side.
29'
Kante leads the charge for the visitors once again. He executes a neat one-two with Batshuayi before pulling the ball back across the area, but West Ham clear the danger.
27'
Chelsea are starting to dominate in terms of possession and West Ham cannot afford to give their opponents too much time on the ball or they will more than likely be punished.
25'
The Blues have reached the quarter-finals of this competition in four of the last five seasons. They were beaten by Stoke at this stage 12 months ago and will be desperate to avoid history repeating itself here.
23'
Chelsea have begun playing with a lot more purpose over the past few minutes. They are putting sharp moves together at pace, but are lacking the cutting edge in the final third thus far.
21'
GREAT SAVE! That would have been some way to mark your first start for Chelsea! Chalobah takes a touch out of his feet and lets fly from the edge of the penalty area with a venomous strike. Randolph sees it late, but gets a vital hand to the ball to tip it over the crossbar.
19'
Speaking of omens, recent history suggests that Chelsea will be eager to turn this match around. The team that have beaten West Ham in this competition have gone on to win the Premier League title in each of the last three seasons.
17'
Kouyate's header was the first goal that Chelsea have conceded in four games. It is also worth noting that each of the two previous meetings between the sides in this competition have ended in 1-0 victories in favour of the home side. That certainly looks like a good omen for the Hammers.
15'
NO PENALTY! West Ham have their tails up and continue to apply the pressure. A neat move sees an advanced Cresswell lay off Payet, who clearly has his legs taken before he can shoot on goal. There is no whistle as Antonio sweeps the ball wide of the target, much to the dismay of everyone in Claret inside the London Stadium.
13'
That goal was slightly against the run of play but West Ham will not care in the slightest. That was a magnificent header from Kouyate, who left Begovic with absolutely no chance.
11'
C. Kouyaté has scored a goal for West Ham United! Assist by M. Noble.
Noble showed great awareness to pick out Kouyate with a great ball into the box.
WHAT A HEADER FROM KOUYATE - WEST HAM LEAD!!! Some good work from Antonio down the right flank earns West Ham a free-kick, which is well cleared by Luiz. However, from the resulting corner, Noble whips the ball back into the area, where Kouyate leaps to place a wonderful header firmly beyond the dive of Begovic. The London Stadium erupts as the Hammers strike first in the London derby.
10'
The summer signing from Leicester opened his account for Chelsea in a similar fashion on Sunday, but sent his shot straight down the throat of Randolph on this occasion.
8'
CHANCE! The Blues apply good pressure on West Ham with Kante leading the charge. He checks inside Noble before seeing his well-struck effort firmly beaten away by Randolph.
7'
Conte was criticised by Jose Mourinho for his touchline antics on Sunday. However, the Italian does not appear to have been too effected, as he is already out of his dugout and barking instructions at his team.
5'
The Hammers enjoy some time on the ball and are awarded a free-kick after Aina brings down Antonio. There is a nervy moment for Chelsea when Begovic punches the delivery high up into the air, but they are reprieved when West Ham are penalised in the area.
3'
Chelsea have made a very bright start to the contest. Aina forces Ogbonna into conceding a corner, which is met by Terry from Willian's delivery. He cannot keep his effort down, though, and West Ham can relax.
1'
KICK-OFF! The referee blows his whistle and Chelsea get the match underway.
Hello and welcome to LIVE text commentary of the 2016/17 EFL Cup! We've reached the last-16 stage and have a mouth-watering capital derby in store as West Ham United host Chelsea at the London Stadium. It's good to have your company!
Both sides are in good form and protecting winning runs coming into this tie. West Ham have won their last two matches 1-0 against Crystal Palace and Sunderland, while Chelsea have also kept clean sheets in victories over Hull City, Leicester City and Manchester United. However, one streak will have to give here, with only one team advancing to the quarter-finals.
WEST HAM (3-4-3): Randolph; Kouyate, Reid, Ogbonna; Fernandes, Noble (c), Obiang, Cresswell; Antonio, Payet, Lanzini.
Slaven Bilic is clearly taking the competition seriously as he makes just two changes to the West Ham side that edged out Sunderland thanks to Winston Reid's 94th-minute winner on Saturday. Darren Randolph replaces Adrian in goal just like he did against Accrington Stanley in the previous round, while Aaron Cresswell returns from suspension as Simone Zaza drops to the bench alongside Andre Ayew, who is back following a lengthy lay-off through injury. Talisman Dimitri Payet starts at the spearhead of a three-man attack alongside Manuel Lanzini and Michail Antonio.
WEST HAM SUBS: Adrian, Nordtveit, Feghouli, Zaza, Collins, Ayew, Fletcher.
CHELSEA (3-4-3): Begovic; Luiz, Terry (c), Cahill; Aina, Kante, Chalobah, Azpilicueta; Willian, Batshuayi, Oscar.
John Terry returns to make his first appearance since September 11 in one of seven Chelsea changes from the demolition of Man United on Sunday. Terry will play alongside David Luiz and Gary Cahill as Antonio Conte sticks with the tried and trusted 3-4-3 formation. Oscar starts as he makes his 200th appearance for the club, while Willian and Michy Batshuayi will also be hoping to impress. Cahill, Luiz, Cesar Azpilicueta and N'Golo Kante are the only survivors from the weekend, while the likes of Eden Hazard, Pedro and Diego Costa are on the bench.
CHELSEA SUBS: Eduardo, Alonso, Hazard, Pedro, Costa, Matic, Solanke.
HERE THEY COME! The players are making their way out onto the pitch and kick-off is just moments away...
HALF-TIME: WEST HAM UNITED 1-0 CHELSEA
Cheikhou Kouyate's bullet header is the difference between the sides at the end of an entertaining first half at the London Stadium. Chelsea need to be more decisive in the final third after the break, while West Ham cannot afford to cut their opponents any slack.
The teams are back out on the pitch and the second half is imminent.
FULL-TIME: WEST HAM UNITED 2-1 CHELSEA
That's all from the London Stadium! Thank you for following the LIVE action of the 2016/17 EFL Cup fourth round - hope you've enjoyed it. Until next time, a very good evening to you all!
Cheikhou Kouyate and Edimilson Fernandes' first goal for West Ham did the trick for the Hammers, who came out on top in the London derby. Gary Cahill scored a consolation in the dying seconds, but Chelsea's three-match winning streak comes to an abrupt end.
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