The Spanish midfielder has lamented The Gunners' inability to defend set-pieces against the Blues on Saturday, but insists his team can right their wrongs against Olympiakos
The 30-year-old has been a regular for the Gunners this season and insists he has been very encouraged by what he's seen from his team so far.
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"In fact it has been the opposite, we have been better than them through the 90 minutes. I think that is a very positive thing. We will bounce back on Wednesday."
Fernando Torres and Juan Mata both netted to secure victory for the Chelsea at the weekend, with both goals coming from set-pieces.
And the former Everton man admits that whilst he is encouraged by the start the north Londoners have made to the campaign, their frailties when defending dead-ball situations is something that needs to be addressed.
"We have conceded three goals from three set-pieces in the last two games that cost us points and it is not good enough," he added.
"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.
"You cannot blame one player, you have to clear the lines so quickly and you cannot allow runners like that in the box, and it was the same sort of ball for both goals.
"It hurts when you lose points at home against teams like that and you feel you haven't deserved to lose. It is frustrating, but I think it was our own fault because we didn't defend those set-pieces."