Arsenal will be without defender Hector Bellerin for up to four weeks after the Spaniard was ruled out with an ankle injury.
Bellerin suffered a kick to the ankle by Tottenham's Danny Rose during a challenge in the closing stages of their 1-1 draw in the north London derby on November 6.
The Spaniard was hopeful the problem would resolve itself as he trained with the Spanish U21s during the international break, but it has not cleared up and he could now face a month on the sidelines.
When asked about the fitness of Bellerin, Wenger replied: 'Hector is out for four week, he was injured in the last 10 seconds against Spurs with a strong tackle from Danny Rose.