Grealish is booked for arguing with the referee. The Villa captain felt their should've been a foul in the build-up to the second Saints goal.
Armstrong is booked for excessive celebrations.
FULL TIME: Southampton 2-0 Aston Villa
90' +5
S. Armstrong has scored a goal for Southampton! Assist by C. Adams.
GOALLL! GAME OVER! Armstrong breaks on the counter from a Villa corner and finishes into an open net with Reina caught upfield.
A brilliant ball from Adams who picked the ball up from the Villa corner, picks out Armstrong on the counter attack and the midfielder finishes into an open net to kill the game off.
90' +4
Grealish wins a corner for Villa and Reina has come up for it.
90' +2
Adams and Obafemi link up well and it ends with the home side winning a corner.
90'
F. Guilbert gets yellow.
A late challenge by Guilbert leads to him becoming the third Villa player to be booked this afternoon.
There will be four added minutes at the end of the second half.
87'
Grealish loses out to Romeu on the edge of the penalty area after some good build-up play by Samatta.
85'
Southampton could regret these missed chances if Villa were to snatch a late equaliser here. The home side have dominated possession and had all the chances to put this game to bed but it remains 1-0.
83'
Djenepo wins his side a corner after taking on Guilbert who has to knock the ball behind.
82'
Trezeguet gets in behind and has a shot on target but the play is pulled back for an offside.
81'
Borja Bastón enters the game and replaces M. Nakamba.
Villa make their final change of the match with Baston replacing Nakamba.
Minute
Description
80'
Oriol Romeu enters the game and replaces W. Smallbone.
Smallbone's debut comes to an end as he is replaced by Romeu.
77'
Trezeguet tries to knock the ball around Stephens but ends up commiting a foul.
75'
Djenepo fouls Hause which relieves the pressure being piled on the visitors.
73'
C. Adams enters the game and replaces S. Long.
M. Obafemi enters the game and replaces D. Ings.
It's a double change at striker for the home side as Ings and Long are replaced by Adams and Obafemi.
72'
Pepe Reina gets yellow.
Reina gets himself in a mess as he comes to head the ball clear and ends up clattering into Long who wins a free-kick.
71'
Bertrand shoots from range but is well held by Reina after a deflection came off Mings.
70'
The change in formation has worked for Villa who are pressing the home side into mistakes and creating more chances around the Southampton penalty box.
69'
Samatta's shot on the turn is deflected over the bar. The striker could have left it for Hourihane who was arriving into the box.
68'
Former Saints defender Targett is lucky not to receive a booking for a late tackle on Ward-Prowse.
67'
Hourihane has a shot from distance but it's blocked by Hojbjerg after Trezeguet broke forward leaving Bednarek on the floor.
65'
Trezeguet forces Bednarek to concede a throw in near the Southampton penalty box. Villa are beginning to play the ball around more as they look for an equaliser.
62'
Villa are still yet to have a shot in this game, whilst Southampton have had 20.
60'
Konsa is replaced by Hourihane as Dean Smith makes his second change of the game and opts for a change in formation too.
59'
C. Hourihane enters the game and replaces E. Konsa.
58'
Dean Smith is yet to see a reaction from his players. Southampton have picked up from where they left off and continue to dominate the ball and create dangerous chances.
55'
Ward-Prowse has done really well handling the threat of Grealish and Targett. Villa look lost in attack without the ball finding itself at the feet of their captain.
54'
Grealish lifts the ball towards the back post but the ball spins out of play for a goal-kick.
52'
Ings tries his luck with a scissor kick but it's deflected clear by Mings. The ball falls to Armstrong who strikes at goal but Grealish is there to block the shot.
51'
Saints win another corner after Hojbjerg lifts a ball in behind the Villa defence for Armstrong to cross but Hause clears it behind.
50'
Mings sticks a foot in and wins the ball off Djenepo after the winger dribbled past four Villa players.
49'
Stephens is forced into conceding a corner after a dangerous cross was played into the box by Targett.
47'
Grealish picks the ball up on the left and looks to pick out Samatta but his pass is wayward and Bertrand breaks on the counter attack.
46'
We're underway for the second half.
45' +4
E. Konsa gets yellow.
Konsa picks up a booking for a foul on Djenepo.
HALF TIME: Southampton 1-0 Aston Villa
45' +3
Ings wins a corner for Southampton as they look to double their lead just before the break.
Appeals for handball against Konsa are waved away by the referee and Villa get the ball clear of their penalty box.
45' +2
Djenepo threatens down the left but Konsa does well to clear the danger.
45'
Grealish is pulled back by Ings but referee Craig Pawson doesn't give the striker a booking. It's fair to say the Villa captain isn't too pleased with that decision.
There will be four added minutes at the end of this half.
43'
Ward-Prowse delivers yet another dangerous ball into the box but Mings deals with it well.
41'
Djenepo is fouled by Douglas Luiz as he looked to start a counter attack. Five minutes left to go plus added time.
39'
Bertrand tries his luck from distance but his shot flies high into the stands.
38'
A good move by Villa that started with Reina ends with McCarthy saving a powerful shot by Grealish as he cut in on his right foot and looked to finish at the near post.
36'
Samatta tries to hold the ball up and allow Trezeguet to get into space but Stephens does well to win the ball back.
34'
Grealish hasn't been allowed into this game at all so far with Ward-Prowse sticking to him like glue all over the pitch.
32'
Villa lucky to escape again after Ings has a shot denied by Reina.
30'
Ings forces Reina kick the ball straight out of play after some good pressing again by the striker.
28'
Trézéguet enters the game and replaces A. El Ghazi.
El Ghazi can't continue and is replaced by Trezeguet as Villa's first change of the match.
25'
Guilbert wins a corner after El Ghazi was fouled by Bertrand.
22'
McCarthy gets away with an error after kicking the ball off of Stephens, almost allowing Samatta in for an open goal.
20'
Villa are starting to knock the ball around with some more confidence now after a difficult opening 20 minutes.
15'
Villa may be a goal down already but their fans are doing everything they can to lift their spirits and get them going.
14'
Ings and Long are doing a great job of hounding the Villa defence and forcing them into mistakes to win the ball back.
Djenepo feeds Bertrand in down the left but the defender can't get his shot on target and it flies wide of the post.
13'
Reina is a lucky man as he just clears the ball in time as Ings was hunting him down.
12'
Grealish whips in a corner right on top of McCarthy who does well to punch the ball clear of any danger.
10'
Villa look to respond quickly as Grealish brings the ball forward but his diagonal pass is cut out by Bertrand.
8'
S. Long has scored a goal for Southampton! Assist by M. Djenepo.
Djenepo gambles and gets to a loose ball before it goes out for a corner and clips the ball towards the near post where Long was waiting to finish. The home side have made their early pressure pay off.
GOAL! Long puts the ball in at the near post and the home side are in front after just eight minutes! A tidy finish off his knee is poked past Reina in the Villa net.
5'
Djenepo does well to get into the visitor's penalty box with some nice dribbling but he loses out to Konsa who clears well.
3'
Mings heads away a dangerous cross by Ward-Prowse as Hojbjerg looked to get in at the far post.
2'
Southampton have an early corner after Konsa lets the ball bounce in the penalty box meaning Mings has to clear the danger.
1'
We're underway at St. Mary's.
Ward-Prowse is filling in at right back with Smallbone in midfield alongside Hojbjerg, with Djenepo and Armstrong playing slightly wider.
Welcome to live coverage of Southampton v Aston Villa in the Premier League.
Southampton can go level on points with Arsenal with a win today. Meanwhile, if Aston Villa pick up a win they can move up to 15th and put themselves four points clear of the relegation zone.
SUBS: Angus Gunn, Jannik Vestergaard, Yann Valery, Oriol Romeu, Sofiane Boufal, Che Adams, Michael Obafemi.
SOUTHAMPTON XI (4-3-3): Alex McCarthy; William Smallbone, Jack Stephens, Jan Bednarek, Ryan Bertrand; James Ward-Prowse, Stuart Armstrong, Pierre Hojbjerg; Moussa Djenepo, Danny Ings, Shane Long.
ASTON VILLA XI (3-4-3): Pepe Reina; Ezri Konsa, Tyrone Mings, Kortney Hause; Matt Targett, Douglas Luiz, Marvelous Nakamba, Frederic Guilbert; Anwar El Ghazi, Mbwana Samatta, Jack Grealish.
SUBS: Orjan Nyland, Bjorn Engels, Ahmed Elmohamady, Danny Drinkwater, Conor Hourihane, Trezeguet, Borja Baston.
Aston Villa manager Dean Smith last faced Southampton at St. Mary’s on the final day of the 2010-11 League One season when he was Walsall manager, losing 3-1 in what was Southampton’s last game in the third tier.
The teams are walking out onto the pitch with kick off minutes away.
Ralph Hasenhuttl will want more of the same from his side in the second half as they look to go level on points with Arsenal in 10th. Aston Villa have been poor and will surely be better after the break after not having a single shot in the first half.
That's it for our live coverage of Southampton v Aston Villa. Goodbye.
Southampton stay in 12th place but move level on points with Arsenal and sit 10 points clear of the relegation zone. The defeat for Villa means they sit just one point above the bottom three in 17th, having played a game more than those teams around them. An EFL Cup final against Manchester City at Wembley awaits the Villans next weekend.
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