83' Mount's free-kick travels over the head of Leno and to the back post where Jorginho converts.
34' Lampard has seen enough and alters the shape of his team. Emerson is withdrawn for Jorginho. Azpilicueta will drop into left-back and Tomori out to right-back.
33' Kante beats a challenge down the right flank and tries to lift a cross towards Abraham, but he loops the ball straight to Leno.
30' Kante follows Mount into the book for pulling back Torreira. It's not going Chelsea's way at the moment.
29' Rudiger misplaces an offload out to the left flank that travels straight out for a throw-in. Chelsea are struggling to get their passing game going.
28' Chelsea apply pressure on Leno and it yields a mistake from the keeper as he plants his clearance straight out for a throw-in. Lampard will want to see more of that pressing from his team.
25' Lacazette latches on to an offload from Aubameyang down the left flank and goes for an early cross towards the near post. Nelson makes the run, but the ball finds Kepa ahead of the winger.
13' GOAL!!! AUBAMEYANG HEADS ARSENAL IN FRONT!!! 1-0!!!! Aubameyang pounces from close range to put the Gunners into a deserved lead. Torreira's corner is flicked on by Chambers at the near post. Aubameyang is the first player to react as he gets ahead of Tomori before stooping to power a header past Kepa into the back of the net. The perfect start for Arteta.
12' Aubameyang makes a driving run down the left flank and he wins a corner off the legs of Rudiger.
11' SAVE! Willian squares the ball for Mount to strike and he stabs an effort at goal from inside the box. Leno reacts to make the save before gathering at the second attempt.
10' Kovacic releases Willian down the left flank on the edge of the box and Guendouzi dives in with a reckless challenge to concede a free-kick.
9' SAVE! David Luiz lines up the strike and he connects with his effort, but it's straight at Kepa, who makes a comfortable save.
7' Ozil finds space in the final third and he draws a foul from Tomori 30 yards from goal. David Luiz stands over the free-kick.
5' WIDE! Nelson wins another set-piece courtesy of another run at Tomori. Ozil floats a cross into the box for David Luiz to attack with an ambitious overhead kick, but the ball travels away from goal and behind for a goal-kick.
4' Ozil takes the free-kick with his left foot, but he fails to find a team-mate with his cross into the box, allowing the visitors to clear the danger.
1' We're underway at the Emirates Stadium.