Ainsley Maitland-Niles’ dismissal shortly after the half-hour mark gave the north Londoners a huge mountain to climb.
Emery was disappointed with the sending off and said: “Our game-plan was to be strong.
Mesut Ozil missed Arsenal's defeat to Leicester with a foot injury (Image: GETTY)
We are going to wait for tomorrow and Tuesday to see if he will be fit for Valencia
Unai Emery on Mesut Ozil
“Today in our defence moments and attacking moments we didn’t take our chances.
“We started very well. The idea was to control with possession. We wanted to be competitive.
“The second yellow card gave us a lot of problems.”
He added: “The first yellow was not a yellow card for. I don’t agree with the decision.”
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Unai Emery doesn't know if Mesut Ozil will be fit to play against Valencia (Image: GETTY)
Arsenal suffered a 3-0 defeat to Leicester on Sunday afternoon, denting their top-four hopes (Image: GETTY)
Emery called for his troops to forget about their third consecutive defeat ahead of Thursday’s clash with Valencia, which is now very much pivotal to their Champions League hopes.
“We are going to prepare for the next match against Valencia,” the Spaniard said.
“The most important thing is to be clear in our minds. We need to prepare for Valencia.”