Arsène Wenger says Arsenal will miss the injured Mikel Arteta for three reasons: his quality, his intelligence and his winning mentality.
Arteta had previously started all of the Club's Premier League games this season before being forced out of Sunday's defeat to Manchester City with a calf strain.
Wenger admits his team will miss the influence of Arteta, but is hoping to have the midfielder fit again sooner than expected.
"Arteta's injury could be shorter than three weeks because it's a minor calf strain," he told Arsenal Player. "It's a light grade one so it could be quicker than three weeks.
"Mikel Arteta is an important player. First of all, he's a good player, a tactically intelligent player, and a winner. He has three important qualities that you miss when you don't have him.
"It's not in that area that we made the mistakes on Sunday. We want to dominate more at home defensively. City have good players up front. They are very dangerous but even when you miss Arteta, that doesn't explain why we were 2-0 down on Sunday."
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