Aaron Ramsey has admitted that a couple of mental lapses was the reason for Arsenal's 2-1 defeat at home to Borussia Dortmund last night.

Welshman Ramsey, who has been one of Arsenal's main stars this season, has told Arsenal Player that 'a draw would have been a fair result' after a late Robert Lewandowski strike saw off the Premier League leaders. 

The defeat was not only Arsenal's first in 13 games but it has also thrown their Champions League group wide open, with themselves, Napoli and Dortmund on six points. The loss at home to the German side, therefore, could become even more crucial in determining the final group standings, with Arsenal still to travel to Italy and Germany. 

Despite the Gunners near flawless run after their opening-day defeat to Aston Villa, they were exposed in the first half an hour by a ruthlessly efficient Dortmund side managed by Jurgen Klopp, who is rumored to be one of the front-runners for the Arsenal manager's job after it eventually is vacated by Arsene Wenger.

And it was Ramsey who was at fault for Dortmund's first goal, giving the ball away on the edge of his box to Lewandowski, who was able to tee up Henrikh Mkhitaryan to slot the ball past Szczesny.

"I was disappointed with the way they scored their first goal," Ramsey said to Arsenal Player.

"I got caught on the ball and that was disappointing. We were a bit slow to start but I thought after about 25 minutes we got into the game, we got our goal and then we took that into the second half." 

Despite Olivier Giroud's goal and the Gunners much improved performance in the second half that saw a goal disallowed and Santi Cazorla hitting the bar, a classic break-away by Dortmund found Lewandowski in acres of space to slam the ball home.

Ramsey, however, believes the goal was against the run of play and that "a draw would have been a fair result." 

"I felt like we were in control of the game but then we switched off for 30 seconds, we were in their box and 30 seconds later the ball is in the back of our net."

"We were in control of the game, we didn't look like we were going to concede, but then we did. That happens [when you switch off].

"We showed good character getting back into the game. On another night we may have taken the lead but we have to learn from the way we defended for the second goal."

Arsenal's next Champions League match is against Dortmund on 6 November. 

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