Gunners captain believes the 2-0 defeat to Bundesliga kings in the Champions League comes down to one thing.
Mikel Arteta was one of a number of Gunners who registered a disappointing performance at the Signal Iduna Park as Arsenal dropped a convincing 2-0 loss to Borussia Dortmund earlier this evening, Tuesday.
Arsenal were outplayed in a number of departments.
Despite recording a superior amount of passes (498 to BvB's 384) and enjoying a greater share of the possession (55% to 45%), Arsene Wenger's side failed to sufficiently test the opposition goalkeeper as Roman Weidenfeller was called into action just once with four other shots off target - a stark contrast to Dortmund's 23 shots, with seven on target.
Explaining the defeat, captain Arteta said, as quoted by the club's official website: "They've got a lot of pace and put us under a lot of pressure up front.
"We gave the ball away too many times in our own half," he added. "They took the game where they wanted to take it and that's disappointing for us."
Arteta was responsible for one error which led to a Dortmund shot, lost possession 11 times and failed to make a clearance, create a chance or even attempt a shot.
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"We played against one of the top sides in one of the most difficult stadiums in Europe - we knew that from the start," Arteta added.
"They put us under a lot of pressure and we conceded a goal with just 20 seconds to go in the first half from our throw-in on the other end of the pitch.
"After you go 1-0 down here it's very difficult. They were very good on the break and we didn't perform well enough tonight.