The pace of the game has dropped slightly in the last few minutes, with Chelsea keeping possession and running the clock down, with Luton unable to create anything at the other end.
90'
There will be a minimum of three minutes added time played at the end of the second half.
88'
Werner still looks keen to get a goal today and end his poor run of form for Chelsea, but it doesn't look like it will happen for him.
86'
Penalty saved by S. Sluga!
PENALTY MISSED! Werner tries to fire the ball into the right-hand corner of the net. However, he doesn't get it close enough to the corner and Sluga makes a brilliant save to deny him.
PENALTY SAVED! Sluga dives the right way and makes a superb save to push the ball away to safety and deny Werner. It was at a good height for the keeper, who makes sure the scoreline remains 3-1.
85'
J. Clark gets yellow.
Clark is also shown a yellow card for his challenge on Werner, which has handed Chelsea a penalty.
84'
M. Kovačić enters the game and replaces M. Mount.
Another Chelsea substitution now, with Mount coming off and he has been replaced by Kovacic, who is also passed the armband.
83'
Mount has played well for Chelsea today, he has worn the captains armband and has been heavily involved, getting up and down the pitch, alongside Gilmour.
79'
Another decent spell of possession here for Luton, but Chelsea are looking very comfortable now they have regained their two-goal cushion.
77'
K. Havertz enters the game and replaces H. Ziyech.
O. Giroud enters the game and replaces T. Abraham.
Double change by Chelsea, with the goalscorer Abraham replaced by Giroud.
Ziyech is also heading off and he has been replaced by Havertz.
Minute
Description
75'
G. Moncur enters the game and replaces K. Naismith.
Another substitution now by Luton, with Naismith coming off and he has been replaced by Moncur.
74'
T. Abraham has scored a goal for Chelsea! Assist by C. Hudson-Odoi.
GOAL! Abraham has his hat-trick and he makes it 3-1! Superb play by Chelsea, with Hudson-Odoi brilliant down the left wing, he then plays a quick one-two with Gilmour and then squares it across to Abraham, who had a tap-in from just a couple of yards out.
Hudson-Odoi has been excellent since coming on a few minutes ago and he uses his pace to great effect down the wing, before linking up well with Gilmour and then putting it on a plate for Abraham.
71'
Decent chance! Hudson-Odoi gets on the end of a good cross by James from the right, the winger takes a touch and then fires a shot towards goal. However, Naismith gets across and makes an excellent block.
70'
C. Hudson-Odoi enters the game and replaces C. Pulišić.
Here is the first Chelsea substitution of the game, with Pulisic the man coming off and he has been replaced by Hudson-Odoi.
66'
No changes for Chelsea just yet, despite a disappointing last few minutes, which has seen Luton control possession and forced the hosts to do some defending of their own.
64'
Close! Lockyer with a little flick towards goal after a corner is headed across the box, forcing Kepa to make the save. However, the flag is up for offside, so it wouldn't have counted.
63'
Luton are starting to cause Chelsea a few problems now, the recent chance and some fresh legs has revitalised them and they look dangerous. Can they get an equaliser?
61'
K. LuaLua enters the game and replaces J. Bree.
L. Berry enters the game and replaces R. Tunnicliffe.
Another Luton change sees Bree come off the pitch and he has been replaced by LuaLua.
Tunnicliffe is also heading off and he has been replaced by Berry.
60'
J. Collins enters the game and replaces H. Cornick.
Luton have made a triple substitution, with Cornick the first man to come off and he has been replaced by Collins.
58'
Blocked! Ziyech this time with an effort at goal himself, after Luton fail to clear the danger and the winger drills a shot towards Sluga, but it is well blocked by Naismith.
56'
Decent effort! More good play by Ziyech down the right wing, he gets into the penalty area and then pulls the ball back to Mount on the edge of the box. However, he powers his effort just over the bar.
55'
We're 10 minutes into the second half now and it is Chelsea who look the more dangerous side, but as we have already seen, Luton could go on and test Kepa. They aren't out of this just yet.
53'
Another great ball into the box by Ziyech, he drills it across the six yard box, but none of his Chelsea teammates pounce on it and the chances goes away. Any touch on that and it would have gone in.
48'
Chelsea are pushing forward in numbers quickly here, looking to make a bright start to the second half and extend their lead early on.
46'
D. Potts enters the game and replaces G. Rea.
The second half is under way!
Luton have made a substitution ahead of the second half, with Rea the man coming off and he has been replaced by Potts.
45' +3
HALF-TIME: CHELSEA 2-1 LUTON
45' +2
Last opportunity for Luton to create something right at the end of the half after Dewsbury-Hall is brought down by Mount and Luton have a free-kick in a good position. Cornick meets it, but his header is straight at Kepa, who makes a comfortable save.
45'
There will be a minimum of two minutes added time played at the end of the first half.
44'
Not too far away! Mount whips a ball into the box, which doesn't quite go to plan, but it ends up not being too far off the far post.
42'
It's all Chelsea in these final few minutes of the first half, they are keeping the ball very well and Luton have everyone back behind the ball defending, making it very compact and difficult for the hosts to break down.
40'
There isn’t long left to play until the end of the first half now, will we see anymore goals before the half-time whistle?
34'
Not too far away! Pulisic finds a little bit of space on the edge of the box, he shifts the ball onto his right foot and then tries to curl it into the top right-hand corner of the net. However, he gets slightly too much on it and it flies high over the bar.
32'
Kepa should've done a lot better with the goal, that was the first time he had been called into action today and the shot was very close to him, but he couldn't keep it out.
30'
J. Clark has scored a goal for Luton Town! Assist by J. Bree.
Bree managed to beat Emerson and delivered a good cross to Clark at the near post, who it fired it towards goal and has given Luton some hope.
GOAL! Luton have pulled one back, it's 2-1! The visitors play it really well in the final third, with Bree getting on the ball deep down the right wing and he drills a cross into the box for Clark, who volleys it towards goal and Kepa gets a hand to it, but can't stop it from going in. The keeper should be doing better there.
28'
Decent chance! Pulisic is found at the back post and has plenty of space to fire a shot towards goal, but it is too close to Sluga, who pushes it away to safety.
24'
Another Chelsea corner here, after Lockyer is forced to turn it out of play after a good run and cross by Pulisic down the right wing. Can they get a third goal here?
22'
This is a bit better from the visitors, they are starting to get on the ball more and are getting into the Chelsea final third, but just aren't testing the hosts defence.
20'
Luton win their first corner of the game, which Cornick manages to get on the end of, but his header flies high over the crossbar and doesn't trouble Kepa.
19'
The visitors are struggling to deal with Chelsea down the left, with James and Ziyech linking up well and a lot of the Blues play is coming down that side, including the goals.
17'
T. Abraham has scored a goal for Chelsea! Assist by R. James.
James lofted the ball into the box, not getting too much pace on it and Abraham rose above his marker and powered it into the goal.
GOAL! Another by Abraham, he puts Chelsea 2-0 up! They worked the ball really well in the final third, with James then dinking a lovely cross into the penalty area, which Abraham meets and places it into the back of the net.
13'
This is the perfect start for Chelsea, they look very comfortable in possession and are looking to carve out more opportunities now to try and extend their lead, with Luton having to sit deep.
12'
A little bit of controversy around the Chelsea goal, as there were two goals on the pitch at one point which Luton are complaining about. However, the referee isn't interested and the goal stands.
11'
T. Abraham has scored a goal for Chelsea!
GOAL! Abraham fires Chelsea ahead, it’s 1-0! It comes from a quick throw-in which catches Luton out at the back and Werner sprints forward, gets to the byline and then pulls it back to Abraham, who drills it into the bottom left-hand corner of the net.
8'
Mpanzu does well down the left wing for Luton, getting the visitors into a good position in the Chelsea half. It then comes to Naismith, who whips a cross into the box, but it is too close to Kepa, who comfortably gathers.
6'
We already know that the winners of this match will face Barnsley away from home in the fifth round of the FA Cup, after they beat Norwich City yesterday.
4'
There is a bit of snow on the pitch at Stamford Bridge and a few passes are traveling slowly across the pitch, with Kepa almost caught out with a pass to Emerson in the box, but it just had enough pace on it and the left-back dealt with it.
3'
It's Chelsea with all the early possession here, they are penning Luton inside their own half and the visitors are struggling to get a touch on the ball.
1'
We're under way!
Hello and welcome to our LIVE match commentary of the fourth round FA Cup clash between Chelsea and Luton Town at Stamford Bridge.
Chelsea overcame League Two Morecambe 4-0 in the third round of the FA Cup and today they play lower league opposition in Luton, who beat fellow Championship side Reading 1-0 in the last round.
CHELSEA SUBS: Kai Havertz, Antonio Rudiger, Olivier Giroud, Cesar Azpilicueta, Jorginho, Ben Chilwell, Mateo Kovacic, Willy Caballero, Callum Hudson-Odoi.
CHELSEA (4-4-2): Kepa Arrizabalaga; Reece James, Kurt Zouma, Andreas Christensen, Emerson; Hakim Ziyech, Mason Mount, Billy Gilmour, Christian Pulisic; Timo Werner, Tammy Abraham.
LUTON SUBS: James Collins, Dan Potts, George Moncur, Elliot Lee, James Shea, Luke Berry, Danny Hylton, Kazenga LuaLua, Sam Nombe.
LUTON (4-1-4-1): Simon Sluga; James Bree, Tom Lockyer, Glen Rea, Sonny Bradley; Pelly-Ruddock Mpanzu; Jordan Clark, Ryan Tunnicliffe, Kiernan Dewsbury-Hall, Kal Naismith; Harry Cornick.
Since their FA Cup victory, Chelsea have beaten Fulham, but then suffered defeat against Leicester in Premier League, which leaves them 9th in the table. Meanwhile Luton are 13th in the Championship table, but they suffered a 1-0 defeat against Brentford last time out.
The teams are out on the pitch and kick-off is just a few minutes away, stay tuned for all the match action!
Luton changed their formation slightly in midway through the half, which worked to their advantage and they did well to pull a goal back. However, since then Chelsea have carved out a couple more chances, with the visitors sitting deep to try and soak up the pressure.
That's all from us today folks, we hope you enjoyed the game!
Lampard's side will face Barnsley in the next round in a couple of weeks time. They will now turn their attentions back to the Premier League, as they face Wolves in midweek. Meanwhile Luton will return to Championship action next weekend, as they travel to Blackburn Rovers.
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