Arsenal's squad has been hit by a bout of food poisoning in China.
Per Mertesacker and Olivier Giroud were unable to take part in a 1-1 draw against Bayern Munich.
Sead Kolasinac started but was forced off in the first-half after throwing up on the pitch.
Arsenal won in a penalty shoot-out to decide the winning team but were more concerned about the lengthy casualty list.
Theo Walcott and Aaron Ramsey were also unwell but able to come on from the bench.