Foul by Semi Ajayi.
Alexandre Lacazette wins a free kick in the defensive half.
90+1'
5' of added time...
90'
GOAL! ARSENAL 3-1 WEST BROM (Willian, 90')
87'
Tierney gets in a low cross from the left which finds Calum Chambers on the edge of the box, but his first-time effort flies way over the crossbar.
85'
Matt Phillips tries a through ball, but Matheus Pereira is caught offside.
81'
Attempt missed.
Darnell Furlong header from the centre of the box is too high.
79'
Foul by Bukayo Saka.
Okay Yokuslu wins a free kick in the defensive half.
76'
Thomas Partey replaces Dani Ceballos.
76'
Conor Gallagher is shown the yellow card for hand ball.
73'
Attempt missed.
Darnell Furlong header from very close range is close, but misses to the right.
68'
Grady Diangana replaces Callum Robinson.
67'
GOAL! ARSENAL 2-1 WEST BROM (Pereira, 67')
65'
Bukayo Saka tries a through ball, but Alexandre Lacazette is caught offside.
63'
Tierney replaces Smith Rowe.
61'
Martinelli is replaced by Lacazette.
58'
CORNER!
Pereira whips a dangerous ball into the near post where Holding does well to head clear.
56'
Robson-Kanu replaces Diagne.
53'
Pepe tries to move the ball quickly into the feet of Martinelli, but the Brazilian's touch lets him down inside the penalty area, which allows West Brom to recover.
51'
Foul by Okay Yokuslu.
Emile Smith Rowe wins a free kick in the attacking half.
50'
SAVE!
Now Smith Rowe gets a shot away from 20 yards.
It takes a deflection on the way through, but Johnstone reads it well and gets himself behind the ball to make a comfortable save.
46'
Second Half begins..
H-T'
Arsenal 2-0 West Bromwich Albion
44'
SAVE!
Saka's in again on the overlap as Willian plays him in.
He tries to beat Johnstone at his near post, but the goalkeeper stands firm to make an important block.
39'
Attempt missed.
Gabriel Martinelli right footed shot from outside the box is just a bit too high.
34'
GOAL! ARSENAL 2-0 WEST BROM (Pepe, 34')
32'
FOUL!
Diagne nips in to win the ball back for West Brom and Holding slides in with a challenge, but he catches the striker to give the visitors a free kick on halfway.
29'
GOAL! ARSENAL 1-0 WEST BROM (Smith Rowe, 29')
26'
Willian doesn't take on the shot instead clipping the ball to the back post where Chambers volleys it across goal.
However, it is turned behind for an Arsenal corner... which is headed clear by the visitors.
25'
A decent spell of possession for Arsenal but West Brom are sitting back and coping well.
Eventually, Ceballos wins a free kick for the Gunners in a shooting position.
20'
SAVE!
Elneny has a go from distance, but his strike is straight at Johnstone, who makes a comfortable save.
17'
CHANCE!
Better from Arsenal as Saka gets to the byline. he cuts the ball back but he cannot find a team-mate as the ball rolls to safety on the far side.
16'
Attempt missed.
Matheus Pereira left footed shot from outside the box is close, but misses the top left corner.
13'
Attempt missed.
Matheus Pereira left footed shot from outside the box is close, but misses to the left.
12'
BLOCK!
And it's an important one from Holding!
Robinson looks to bend the ball into the far corner, but Holding gets his head to the ball as Arsenal survive.
9'
Robinson switches the play in search of Diagne, but Chambers is spots it and calmly heads the ball back to Leno.
6'
Attempt missed.
Nicolas Pépé left footed shot from the centre of the box is too high.
2'
Attempt missed.
Matheus Pereira left footed shot from outside the box misses to the right following a corner.
1'
First Half begins..
'
Arsenal Starting XI To Face West Bromwich Albion: Leno, Chambers, Holding, Gabriel, Saka, Elneny, Ceballos, Smith Rowe, Pepe, Willian, Martinelli.
ARSENAL - Lineup
Alexandre Lacazette wins a free kick in the defensive half.
Darnell Furlong header from the centre of the box is too high.
Okay Yokuslu wins a free kick in the defensive half.
Darnell Furlong header from very close range is close, but misses to the right.
Pereira whips a dangerous ball into the near post where Holding does well to head clear.
Emile Smith Rowe wins a free kick in the attacking half.
Now Smith Rowe gets a shot away from 20 yards.
It takes a deflection on the way through, but Johnstone reads it well and gets himself behind the ball to make a comfortable save.
Saka's in again on the overlap as Willian plays him in.
He tries to beat Johnstone at his near post, but the goalkeeper stands firm to make an important block.
Gabriel Martinelli right footed shot from outside the box is just a bit too high.
Diagne nips in to win the ball back for West Brom and Holding slides in with a challenge, but he catches the striker to give the visitors a free kick on halfway.
However, it is turned behind for an Arsenal corner... which is headed clear by the visitors.
Eventually, Ceballos wins a free kick for the Gunners in a shooting position.
Elneny has a go from distance, but his strike is straight at Johnstone, who makes a comfortable save.
Better from Arsenal as Saka gets to the byline. he cuts the ball back but he cannot find a team-mate as the ball rolls to safety on the far side.
Matheus Pereira left footed shot from outside the box is close, but misses the top left corner.
Matheus Pereira left footed shot from outside the box is close, but misses to the left.
And it's an important one from Holding!
Robinson looks to bend the ball into the far corner, but Holding gets his head to the ball as Arsenal survive.
Nicolas Pépé left footed shot from the centre of the box is too high.
Matheus Pereira left footed shot from outside the box misses to the right following a corner.
West Brom - Lineup