The Brazilian had to be substituted just 37 minutes into this week’s London derby, which was only his third appearance for the Gunners since joining from Villarreal in January.
The centre-back will now miss Monday’s FA Cup quarter-final against Manchester United, the Premier League clash agaisnt West Ham, as well as their must-win Champions League last 16 second-leg tie away to Monaco.
“Gabriel has a little hamstring injury and will be out for two to three weeks which means he’s not available for the weekend, West Ham and Monaco, but after that he should be back,” Wenger said.
“Nacho Monreal (back strain) might come back in to the squad. He will have a test today but everybody else should be available from the same squad that played against Queen’s Park Rangers.”