Arsene Wenger admitted after the game that his player should have known better than to react to Costa, who received a booking for his part in the controversy that marred the first half of an absorbing London derby.
“We warn them not to get involved and I don’t understand Gabriel because he usually looks a calm boy,” said Wenger. “You have to be above that. That’s part of the game sometimes.”
Chelsea vs Arsenal - player ratings
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The overturn of Gabriel’s red swells Arsenal’s defensive ranks ahead of their visit to White Hart Lane, with Per Mertesacker rejoining the squad after an absence through illness.
