The Scottish international missed Saturday's 2-0 win over Leicester and has not played for the Gunners since their 2-2 draw with Crystal Palace on October 18.
“Well he didn't train with the team yesterday. He still wasn't feeling good," said Arteta.
“He is still in pain. He is not comfortable when he is running, so he was struggling.
“We are trying to help him as much as possible. We need him back and I don't know when that will be."
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