Arsenal centre-back Laurent Koscielny will miss Monday's Premier League match against Crystal Palace but his Achilles injury is not as serious as first feared.
Koscielny went off at half-time during Arsenal's 2-2 draw with Manchester City last weekend and the France international was absent when the Gunners saw off West Ham 3-0 on Wednesday.
"Koscielny is out for Monday night. I don't know who will be captain - I have not picked the team yet - but last game it was Walcott," said Wenger, who is yet to learn whether Arsenal will be punished by the Premier League after they played the second half against City without a replacement skipper.
"It [Koscielny's absence] will be shorter than expected. It is not a tendon problem."
"He looked composed, quiet, calm and I know personally that he has the quality because I see him every day, so I was not surprised by the quality of his game," Wenger added.
