Stopping Chelsea crossing the ball
One thing that Arsenal did well in the 2-2 draw a Stamford Bridge was to force the Blues into crossing the ball. Cesar Azpilicueta and Emerson do not have the best accuracy with their deliveries.
However, if Olivier Giroud does start as expected, with Reece James and Marcos Alonso out wide, Arteta will instead want his team to double up in wide areas to prevent crosses. The polar opposite of what happened back in January.