Day one of the Post-Coquelin Era starts today. Are you ready? Arsenal better be. This is a Very Big Game; as opposed to those "big games" which mean the difference between finishing first and finishing second, this is a game that Arsenal have to win in order to maintain hope of progressing in this year's Champions League at all.
We also have to hope that Bayern do us a solid, or whatever an equivalent German phrase is, and take maximum points from Olympiakos, but that is academic if Arsenal can't do what they couldn't do in September and beat a team they should beat handily.
We all know the injury situation; TL;DR, it's not good. We all know Arsenal can be good with their backs to the wall - this is the biggest wall Arsenal have backed up to in a while, and hopefully Patchwork Arsenal can rise to the challenge and get through/over/around/under said wall.