Gabriel, 27, was visibly furious when he went off injured in the 64th minute with what appeared to be a groin injury.
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The defender has been a key part of Arsenal’s incredible start to the season, and now Mikel Arteta will be anxiously awaiting any update.
When asked about Gabriel’s injury, Ancelotti said: “Bad? I don't know, he had a problem on his adductor the medical staff have to check tomorrow.
“We are really sorry for this, really disappointed, when players have an injury, I hope they can recover well and soon.”
Arsenal may also be without left-back Riccardo Calafiori for the North London Derby in their first game back from the international break after he left the Italy camp.