Mudryk races down the left flank and lifts a cross to the back post, but it's too long for anyone in the middle and sails behind for a goal-kick.
90' +9
Joao Felix bends a cross into the box from the right flank, but Bazunu comes through a crowd to punch it clear of danger.
90' +8
R. Perraud gets yellow.
Perraud takes out Sterling on a surge down the right flank and goes into the book.
90' +7
J. Ward-Prowse gets yellow.
M. Kovačić gets yellow.
Ward-Prowse is booked for time-wasting for the visitors.
Kovacic is booked for taking out Mara on a counter.
90' +5
Lyanco enters the game and replaces A. Maitland-Niles.
Substitution Ainsley Cory Maitland-Niles Lyanco Evangelista Silveira Neves Vojnović
90' +4
Walcott brings down Mudryk on the charge down the left flank, handing Chelsea a free-kick in a threatening position.
90' +2
Chelsea need to up the ante. Sterling's two chances were extremely close, but they've not been able to find a way through the Southampton defence.
90'
There will be 12 minutes of added time.
87'
I. Diallo enters the game and replaces R. Lavia.
Kepa gets yellow.
R. Lavia gets yellow.
C. Alcaraz enters the game and replaces M. Elyounoussi.
Lavia goes into the book for time-wasting as he dawdles off the pitch.
Elyounoussi is withdrawn for Alcaraz for the visitors.
Diallo replacse Lavia in the middle of the park for the Saints.
Kepa is booked for dissent for the home side.
Minute
Description
86'
Havertz tries to surge his way into the box, but has too many players around him and gets crowded out before he can shoot.
85'
Mudryk surges down the left flank and looks for a team-mate in the middle, but sees his cross blocked.
84'
T. Chalobah enters the game and replaces César Azpilicueta.
C. Gallagher enters the game and replaces B. Chilwell.
Chalobah replaces Azpilicueta, who leaves the field on a stretcher.
Gallagher enters the aciton to replace Chilwell.
81'
Both players are taking time in the break to take on instructions. The medical staff are naturally taking their time to ensure that Azpilicueta is okay to move from the pitch.
78'
Azpilicueta remains down on the pitch and will have to be stretchered off here.
75'
S. Mara gets yellow.
Mara is booked for his high boot on Azpilicueta.
74'
Mara catches Azpilicueta with a high boot flush on the head. It leaves the Chelsea man down on the deck in need of treatment.
66'
Armstrong has space down the right flank and has men in support in the middle, but he fails to find Elyounoussi with his cutback.
64'
K. Havertz enters the game and replaces M. Mount.
M. Mudryk enters the game and replaces N. Madueke.
Mudryk enters the action to replace Madueke for the hosts and will move to the left flank.
Havertz replaces Mount for the hosts after another ineffectual performance from the midfielder.
63'
Southampton are looking solid at the back this afternoon. There's no way through for Chelsea at the moment.
61'
Southampton have space on the counter, but Elyounoussi wastes the opening as he sends a poor cross towards Armstrong in the box.
59'
T. Walcott enters the game and replaces S. Armstrong.
A. Armstrong enters the game and replaces K. Sulemana.
S. Mara enters the game and replaces P. Onuachu.
Adam Armstrong enters the action to replace Sulemana for the visitors.
Walcott replaces Armstrong down the right flank.
Onuachu came close in the first half and is now withdrawn for Mara.
53'
Badiashile rises from the resulting corner, but his flick-on catches Azpilicueta in an offside position in the Southampton box.
50'
CHANCE! Mount has to connect with a header from Sterling's cross, only to mistime his jump. Sterling does brilliantly in the build-up to knock Maitland-Niles off the ball and supply the cross, but Mount is unable to capitalise.
48'
Chilwell looks for Sterling down the left flank, but the forward is caught offside moving a fraction too early.
46'
R. Sterling enters the game and replaces D. Fofana.
W. Fofana enters the game and replaces K. Koulibaly.
We're back under way at Stamford Bridge.
Koulibaly is withdrawn for Fofana at the break for the hosts.
Datro Fofana makes way for the home side and is replaced by Sterling.
45' +5
S. Armstrong gets yellow.
Chilwell sees his cross into the box from the left flank cleared before Mount has a cross on the follow-up charged down by Elyounoussi.
HALF-TIME: CHELSEA 0-1 SOUTHAMPTON
45' +4
Armstrong takes out Chilwell on the charge and goes into the book.
45' +1
J. Ward-Prowse has scored a goal for Southampton!
GOALLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL!!!!! WARD-PROWSE CURLS IT HOME!!!!!!!! 1-0 SOUTHAMPTON!!!!!!! The Saints take a deserved lead through Ward-Prowse from a free-kick from 25 yards. He angles his effort over the wall and it arcs away from Kepa's outstretched hand into the bottom-left corner. A sublime strike from the Southampton skipper.
45'
Armstrong draws a loose challenge from Azpilicueta and wins a free-kick for the visitors right within the range of Ward-Prowse.
42'
Elyounoussi latches on to a loose ball from Ward-Prowse's cross, but he can only hammer his first-time strike well over the bar.
40'
Chelsea keep the pressure on the Saints but Azpilicueta's cross towards Joao Felix floats over the head of the forward.
39'
Chilwell makes a break down the left flank and is halted by Bednarek, although the ball is only half-cleared. Fofana tees up Kovacic, who sees his shot charged down.
35'
Elyounoussi is inches away from taking a loose pass from Fernandez in stride. However, he can't bring it under control on the slide.
34'
Joao Felix slides in to stop Lavia on the charge and gives away a free-kick. Yet another foul this afternoon.
33'
Perraud does well at the back to get the right side of Madueke to prevent him from latching on to an offload from Azpilicueta.
32'
Armstrong pulls back Chilwell on the charge, but does not get booked by the referee. There are a lot of niggly challenges out there.
29'
Chilwell looks for an early cross into the box for Fofana, but the forward is on his heels and allows Bazunu to claim the delivery.
28'
Kovacic threads a pass through to Fofana, who glances it on towards Azpilicueta. He powers a strike towards the near post that slams into the side-netting.
25'
There have been a few injuries that have disrupted the flow of the game.
22'
Chilwell floats the resulting free-kick into the box, but Bazunu comes off his line to claim it with ease.
21'
Chilwell finds space down the left flank and draws a foul from Maitland-Niles. That was a needless challenge that presents Chelsea with a free-kick in a decent position.
20'
Bella-Kotchap goes down under pressure from Joao Felix and requires treatment on the pitch.
18'
Fernandez does well down the right flank to release Azpilicueta, but the full-back cannot keep the ball alive with a cross on the byline.
16'
A. Bella-Kotchap gets yellow.
Perraud is back on his feet and the game resumes.
Bella-Kotchap goes into the book as he brings down Fofana on the charge.
15'
Perraud is down for the visitors in need of treatment. It looks to be an issue with his hand.
14'
Fofana collects a loose ball in the inside-right channel and goes for goal on the half-volley, only to power his effort wide of the target.
11'
Badiashile has to be alert at the back to clear the ball away from Maitland-Niles after he takes the ball in stride in the Chelsea box.
7'
Southampton are edging the early stages of the contest, leaving no space for Chelsea to break out from the back.
4'
K. Koulibaly gets yellow.
Koulibaly catches Onuachu with a boot on his follow-through and gives away a free-kick. The defender also goes into the book for his challenge. Chelsea have made a sluggish start to this game.
1'
We're under way at Stamford Bridge.
Hello and welcome to the live commentary of the Premier League clash between Chelsea and Southampton at Stamford Bridge.
Chelsea are in dire need of a win to ease the pressure on Graham Potter. The Blues somehow managed to lose the first leg of their Champions League round-of-16 match on the road to Borussia Dortmund, despite having a host of chances. Potter's men are now winless in their last four matches in all competitions, and have recorded only one win in their last nine matches. They need a positive result against managerless Southampton today to keep their slim hopes of challenging for a European place alive.
Southampton sacked Nathan Jones just eight league games into his reign as manager following their 2-1 defeat to 10-man Wolves last time out. Jones left the Saints rock-bottom of the Premier League, suffering seven defeats in his eight Premier League games in charge. Despite their struggles, they remain only four points adrift of safety. Ruben Selles is in interim charge this week after talks with Jesse Marsch broke down.
CHELSEA (4-2-3-1): Kepa Arrizabalaga; Cesar Azpilicueta, Kalidou Koulibaly, Benoit Badiashile, Ben Chilwell; Mateo Kovacic, Enzo Fernandez; Noni Madueke, Joao Felix, Mason Mount; Datro Fofana.
CHELSEA SUBS: Marcus Bettinelli, Trevoh Chalobah, Mykhailo Mudryk, Raheem Sterling, Denis Zakaria, Conor Gallagher, Kai Havertz, Wesley Fofana, Lewis Hall.
SOUTHAMPTON (3-5-2): Gavin Bazunu; Ainsley Maitland-Niles, Jan Bednarek, Armel Bella Kotchap; Stuart Armstrong, James Ward-Prowse, Romeo Lavia, Mohamed Elyounoussi, Romain Perraud; Paul Onuachu, Kamaldeen Sulemana.
SOUTHAMPTON SUBS: Kyle Walker-Peters, Lyanco, Adam Armstrong, Willy Caballero, Sekou Mara, Moussa Djenepo, Carlos Alcaraz, Ibrahima Diallo, Theo Walcott.
There will be a minute of applause in memory of former Chelsea player Christian Atsu.
Potter needs a response from his team in the second half. The Blues have won only one of their last nine matches and can ill afford to lose at home to a side with a record of seven defeats in eight in the Premier League. Every single player in a blue shirt needs to raise their game otherwise there will be a lot of uncomfortable questions for their manager to answer at full time.
Thanks for joining our commentary today. Until next time, goodbye.
Chelsea face a huge match against Tottenham on the road next Sunday in the Premier League. Southampton have a relegation six-pointer against Leeds United at Elland Road next Saturday.
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