VAR has taken an absolute age to sort this all out as the lines are drawn and moved. Martin Atkinson says it's a goal. Arsenal lead!
Arsenal 1-0 West Ham
78'
Aubameyang's shot loops into the air and Ozil calmly nods it down for Lacazette to convert from inside the six-yard box.
73'
Xhaka is furious with referee Martin Atkinson as he is penalised for a foul on Noble, despite seemingly winning the ball.
69'
Reiss Nelson replaces Nicolas Pepe.
66'
Aubameyang knocks the ball past Ngakia and picks out Lacazette with a cross. Lacazette's volley is nicely struck, but it hits Cresswell before it can trouble Fabianski.
63'
Yellow card to Sokratis.
59'
Alexandre Lacazette replaces Eddie Nketiah.
58'
Haller flicks on a left-sided cross and Antonio adjusts his body in time to get away a shot. Leno reacts brilliantly to make a point-blank save.
53'
Saka drifts inside from the left and plays the ball through for Nketiah, whose first-time shot is saved by the legs of Fabianski.
48'
Nicolas Pepe's left-footed cross from the right is just too strong for Aubameyang at the far post.
46'
Second Half begins Arsenal 0, West Ham United 0.
HALF TIME'
Arsenal 0-0 West Ham
45+1'
Big penalty appeal for Arsenal now as Nketiah goes under a challenge from Ngakia. Martin Atkinson waves his arms to say no.
44'
Cresswell hooks the ball back into the middle and Luiz takes a risk by leaning in to help it behind with his shoulder.
42'
Diop heads down a corner and Antonio somehow fires wide on the turn from no more than four yards out.
39'
Foul by Eddie Nketiah
38'
Pepe produces brilliant trickery to get away from Ogbonna, but Rice slides in to halt the winger's run before he can shoot.
33'
Arsenal have had nearly 78 per cent of the ball, but it has been a pretty balanced match in terms of chances at either end.
31'
Pablo Fornals right footed shot from outside the box is saved.
24'
Aaron Cresswell left footed shot from outside the box is bit too high from a direct free kick.
22'
Sokratis hits the bar with a header from the centre of the box.
16'
West Ham clear their lines after Arsenal win a corner, but this has been a positive spell for the Arsenal.
13'
Mesut Ozil strike blocked by Aaron Cresswell and Eddie Nketiah's follow up strike is gathered by Fabianski.
9'
Yellow card to Pablo Fornals
8'
Attempt missed.
Granit Xhaka left footed shot from outside the box.
5'
Arsenal are trying to find their rhythm in the opening stages.
3'
Sébastien Haller wins a free kick on the left wing.
1'
Pablo Fornals gets the ball rolling.
'
Teams are coming out onto the pitch at Emirates Stadium, with kick-off just minutes away.
'
Arsenal Starting XI To Face West Ham United: Leno; Sokratis, David Luiz, Pablo Mari, Saka; Xhaka, Ceballos, Ozil; Pepe, Nketiah, Aubameyang
ARSENAL - Lineup
Arsenal 1-0 West Ham
Granit Xhaka left footed shot from outside the box.
Substitute: Martinez, Bellerin, Guendouzi, Willock, Nelson, Martinelli, Lacazette
Substitute: Randolph, Balbuena, Zabaleta, Soucek, Snodgrass, Lanzini, Felipe Anderson
West Ham - Lineup