Following their 4-1 extra-time win against Spurs, the French boss stated: "It is a metatarsal again, it is the one next to the one he had broken, the second one, so we hope we have good news on Wednesday, because that would be a massive blow to us."
Arsenal are already having to deal without the services of skipper Cesc Fabregas, England winger Theo Walcott, Dutch forward Robin van Persie, Danish striker Nicklas Bendtner and midfielder Abou Diaby.
There was other good news with centre-half Thomas Vermaelen having recovered from an Achilles injury and will be available for the visit by West Brom on Saturday.
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