It means Wenger has a selection decision and must weigh up whether Lehmann would be a disruptive influence if he is relegated to the substitutes' bench.
"I have read that (Manuel) Almunia said that he's earned the right to be No1," said Lehmann while on international duty last week. "But so far he has never won us any important matches. I expect to play again, if I am fit. The coach will let me play. He knows that and so do I. Whether I'm out for one week or longer or not is insignificant. In my four years in London I have missed no games because of injury."