J. Vestergaard enters the game and replaces P. Højbjerg.
Hojbjerg is the man to make way so that Vestergaard can come on and take Stephens' place in defence.
Ings also comes off, with Romeu slotting into midfield, leaving Long up front on his own.
90'
Aubameyang is played through down the left and he tries to roll the ball across goal for Lacazette, but it's hacked behind for a corner.
86'
J. Willock has scored a goal for Arsenal!
GOAL!! WILLOCK SURELY SEALS THE WIN FOR ARSENAL!! Lacazette takes the free-kick and his first effort is blocked by the wall, but it ricochets back to him. The striker then thumps a half-volley at goal that McCarthy spills, and Willock is on hand to tuck the ball into the bottom corner! It's 2-0 to Arsenal now!
85'
J. Stephens goes off after a red card!
Hojbjerg plays a terrible back-pass from the left and it runs for Aubameyang to latch onto. Bednarek - the last man - slides in and takes the striker out, and he's sent off for denying a clear goalscoring opportunity!
80'
A. Maitland-Niles enters the game and replaces Dani Ceballos.
Meanwhile, Ceballos makes way for Maitland-Niles on the right of the midfield four.
79'
A. Lacazette enters the game and replaces E. Nketiah.
Arteta now makes a double-change, bringing Nketiah off for Lacazette up front in the first switch.
76'
Southampton are pushing forward to try and level the game in the closing stages, but they've worked hard in the heat and appear to be running out of energy.
74'
Martinez claims a long ball forward and takes his time distributing as Arsenal look to close out the final stages of the game.
70'
S. Kolašinac enters the game and replaces K. Tierney.
That change is now made, with Tierney making way and Kolasinac coming on at left-back.
Minute
Description
69'
Tierney is down with cramp, and Kolasinac is getting ready to come on and replace him.
66'
Arsenal now appear to be playing in a 4-4-2 shape, with Ceballos and Saka out wide in the midfield four, with Aubemeyang up front alongside Nketiah. It nearly pays dividends as the latter tries to pick out the former with a low cross, but McCarthy is out quickly to intercept.
64'
J. Willock enters the game and replaces N. Pépé.
Arteta makes his first change of the evening, bringing Pepe off for Willock.
60'
Martinez deals well with a cross to the back post and tries to get Arsenal on the front foot with a quick counter, but the ball goes astray and Nketiah fouls Hojbjerg in an attempt to win the ball back.
53'
Southampton have started this half - as they did the first - on the front foot, playing with intensity and purpose.
49'
Walker-Peters is involved again as he's found in space on the right, but Saka matches him all the way and turns his cross behind for a corner that comes to nothing.
47'
B. Saka gets yellow.
Walker-Peters is given a rough introduction to the game as he takes a heavy touch, but nicks the ball away as Saka comes flying in and catches the full-back, earning himself a yellow card.
46'
S. Long enters the game and replaces M. Obafemi.
K. Walker-Peters enters the game and replaces Y. Valery.
Hasenhuttl makes a double substitution at half-time as he looks to freshen things up. Obafemi comes off for Long up front in the first change.
Valery is also replaced at right-back by Tottenham loanee Walker-Peters.
We're back underway for the second half!
45' +3
HALF-TIME: SOUTHAMPTON 0-1 ARSENAL
45' +1
Nketiah charges McCarthy down again, but this time the goalkeeper just gets his pass away and the striker is penalised as his momentum carries him into the Saints stopper.
44'
The Gunners have established their authority on the ball in this game now and are taking their time in possession, working it around patiently as the half-time break approaches.
42'
Arsenal try to counter quickly down the left following the Saints corner, with Ceballos feeding Pepe at the byline, but the winger's cross is collected comfortably by McCarthy.
40'
Mustafi and Bellerin both produce important sliding interventions to prevent Southampton players from being played clean through in the box, with the latter turning behind for a corner.
38'
The tempo of the game is gradually slowing down as the half wears on. Southampton's pressing game is demanding and the heat is likely taking its toll as well.
36'
Saints, having retreated into their own half, sought to draw Arsenal forward and create space before pressing high once again, but the Gunners navigated the ball safely back to Martinez and retained possession.
34'
McCarthy tries to go over everyone with a long ball for Obafemi, but the linesman flags for offside.
32'
Arsenal have settled on the ball now and the intensity of Southampton's press has ebbed slightly.
30'
Xhaka nearly plays Arsenal into trouble as he slices his clearance from the left and it ends up going sideways, forcing Bellerin to scramble back and keep the ball in play.
20'
E. Nketiah has scored a goal for Arsenal!
GOAL!!! ARSENAL ARE GIFTED THE LEAD!! Nketiah follows in as the ball is passed back to McCarthy and the Saints goalkeeper inexplicably passes the ball at the Gunners striker! It ricochets back towards goal and the young forward gets there first and rolls into an empty net! It's 1-0 to Arsenal!
19'
Southampton are pressing high and with real intensity, making it very difficult for the Gunners to build from the back.
17'
Saka is back out on the pitch, and Arsenal nearly work a chance on the opposite side as Ceballos and Bellerin work hard to win the ball for Nketiah, who hits the byline and crosses, but it's blocked behind for a corner.
15'
Saka is down holding his ankle after a collision with Hojbjerg in the box. Another injury is the last thing Arsenal need.
11'
S. Mustafi gets yellow.
Mustafi picks up an early booking for a clumsy, late challenge on Ings.
5'
The hosts have started sharply. They're playing with purpose and moving the ball quickly - they look dangerous.
3'
Obafemi nearly carves Arsenal open as he sends Armstrong on his way down the right in plenty of space, but Aubameyang is back to cover and wins the ball before clearing.
1'
We're underway at St. Mary's!
There's an early scare for Arsenal as a throw-in on their right isn't dealt with and Redmond slides a fine ball through for Bertrand to whip into the box. Ings can't quite connect properly with his volley and Armstrong can't sort his feet out in the box to pick up the pieces, allowing the Gunners to hack clear.
Hello and welcome to our LIVE coverage of the Premier League fixture between Southampton and Arsenal at St. Mary's Stadium.
Arsenal - on the road for the third game in a row - will be desperate for a positive result after back-to-back defeats since the restart, losing to both Manchester City and Brighton and Hove Albion. They face a Southampton side that enjoyed a 3-0 win over bottom-of-the-league Norwich City last time out.
Southampton substitutes: Jannik Vestergaard, Shane Long, Nathan Tella, Angus Gunn, William Smallbone, Jake Vokins, Kyle Walker-Peters, Oriol Romeu, Che Adams.
Arsenal XI (4-3-3): Emiliano Martinez; Hector Bellerin, Shkodran Mustafi, Rob Holding, Kieran Tierney; Dani Ceballos, Granit Xhaka, Bukayo Saka; Nicolas Pepe, Eddie Nketiah, Pierre-Emerick Aubameyang.
Arsenal substitutes: Sokratis Papastathopoulos, Reiss Nelson, Matt Smith, Mesut Ozil, Joseph Willock, Ainsley Maitland-Niles, Matt Macey, Sead Kolasinac, Alexandre Lacazette.
Southampton XI (4-4-2): Alex McCarthy; Yan Valery, Jack Stephens, Jan Bednarek, Ryan Bertrand; Stuart Armstrong, James Ward-Prowse, Pierre-Emile Hojbjerg, Nathan Redmond; Danny Ings, Michael Obafemi.
Southampton's pressing game and slick passing in forward areas has caused Arsenal their fair share of problems, but the hosts are yet to really test Martinez in the Gunners goal. Legs seemed to be tiring slightly towards the end of that first half, but Hasenhuttl will be hoping the respite at half-time will be enough to get his side carrying and chasing with intensity again in the second period.
Arsenal face Sheffield United in the FA Cup this weekend, before hosting Norwich in league action. Meanwhile, Southampton travel to Watford.
Thank you for joining our coverage, we hope you enjoyed the game. Until next time, goodbye!
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