"We have lost Kieran Gibbs from Wednesday night but he should be the only one," said Wenger. "We think that he will be out for three weeks.
"I am very disappointed [about it]. I hope it will not put in his mind that he is an injured player. It was just an accident and you cannot do anything about it. Time will help him get over that and it is not major damage in his ankle.
"We should have Gael back. He was in today. He was very weak still but we hope he will progress well. Johan Djourou should be fine."
It is the latest setback for England international Gibbs, whose early career has been plagued by injuries.
The Lambeth-born defender missed the majority of the 2009-10 season with a fractured metatarsal and severely bruised that same left foot in
Arsenal's Carling Cup win at Tottenham
He then sustained medial knee ligament damage during a
Carling Cup victory over Newcastle
on 27 October and was making only his seventh club start this season against Partizan.
"He is unbelievably unlucky," stated Wenger following a 3-1 triumph that sent Arsenal through to the Champions League last 16.
"No [it is not the same ankle he injured previously], it is the right one. He is on crutches. I cannot tell you more. We will know tomorrow [Thursday]."
Gibbs was deputising for first-choice left-back Clichy after he was ruled out through illness.
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