Theo Walcott is expected to recover from a knee injury in time for England's European Championship qualifier against Montengero.
Arsenal are hopeful that the 22-year-old could be available for Wednesday night's Champions League tie with Olympiakos.
"I thought it was a classic hamstring but it is not," said Arsene Wenger after Saturday's victory. "He felt a sharp pain in his knee and at the moment he is with the doctor, I don't know what kind of diagnosis it will be.
"It was completely surprising, no one was near him."