Unwell he was forced to workout in the gym instead, and is being reported as 'uncertain' for the Champions League clash.
His teammate and fellow Frenchman, Francis Coquelin is much more positive.
He told L'Equipe: "Everyone is very focused, whoever plays, we'll be ready to annihilate their attacks. And I'm not worried about Laurent.He was sick, he returned earlier, but he should be alright."
The 21-year-old added he was ready to help out in defence if called upon against the German league leaders by filling in at right-back if Bacary Sagna is shuffled around to cover for Koscielny.
"I played last year in this position, but there are other options. We must try to take advantage at home. It can boost us in the coming weeks."
What do you think of the reports about Koscielny? Can Arsenal still pull off a shock?
image: © Ronnie Macdonald