After watching Arsenal play against two high pressing attacking teams in Chelsea and Man City, it will be interesting to see how Arsenal go against West Ham, who may be more inclined to set up in a low defensive block and counter attack.
If that is the case, Arsenal will need to force West Ham out of their low defensive block to give Arsenal’s pacey forwards, Aubameyang and Lacazette, space behind West Ham’s defensive line to make off the ball runs into, and give Ozil the passing lane to execute through passes.
To do that I think Arsenal will need to stretch the game vertifically by their central midfielders and attacking midfielder transitioning the ball quickly upfield and with the risk of turning the ball over in the central and attacking thirds.
To counteract the greater risk of Arsenal losing possession in those areas of the pitch, due to misplaced passes, I think Arsenal will also need to reinforce their deeplying central midfield with an extra body, and ensure all three deeplying central midfielders have a proven track record of being productive at long range passing, tackling and intercepting.
Based on the above, the starting line up I would like to see Arsenal deploy versus West Ham is: