But they have recovered in time for Sunday's clash at the Emirates, while fellow centre-back Laurent Koscielny could also be involved, after missing the past two weeks with a calf problem.
Wenger said: "Gabriel and Mertesacker should be available.
“Koscielny is not far, will I risk him? I don't know, I haven't made a decision.
Arsenal v Watford - FA Cup match preview
“Laurent's got to join in normal training tomorrow and then we'll think. I'll think after advice from the medical team. If he's available I'll consider playing him.”
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