Theo Walcott did not emerge for training with the rest of the Arsenal squad ahead of Wednesday's Champions League clash with Olympiakos.
The 22-year-old England forward suffered a knee injury during the latter stages of the Gunners' 3-0 win over Bolton last Saturday and, although it is not believed to be a serious problem, it was enough to stop him joining his team-mates at the start of their training session on Tuesday morning.
Despite missing at least some of the session Walcott could still feature against Olympiakos as Arsenal look to follow up a 1-1 draw against Borussia Dortmund with their first win of this season's group stages.
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