You can't run around scared of the next injury as a player. It could happen in training. Or in the next league game. There are no half measures when you face a team like Bayern. You put everything into the game and at least leave with some pride. Otherwise you get absolutely humiliated which is far more damaging than an another injury. They rolled over their closest rivals 5-1 a few weeks back, and that was a Dortmund side giving their all. Thankfully Wenger and the team will have their heads screwed on about how to approach this tomorrow.