Midfielder Mikel Arteta maintains Arsenal must take collective responsibility for their defensive failings against Chelsea.
The Gunners tasted defeat for the first time this season when they went down 2-1 at the Emirates Stadium.
"We have conceded three goals from three set-pieces in the last two games that cost us points and it is not got enough," Arteta said. "I don't think it is something to do with the defence, it is to do with an individual set-up in the game, which is a free-kick or a corner or whatever, and we haven't defended the ball well enough and we conceded three goals in those two games."
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