Arsenal defender Per Mertesacker is confident they have learned their lessons from defeat to Champions League opponents Borussia Dortmund.

They were flying high until Dortmund won at The Emirates on Tuesday to bring them crashing back down to earth.

German international Mertesacker said: "It was a good time to have a lesson. Perhaps we were a little bit overconfident. We are really happy with our situation and I think we'll win enough points to stay on top of the Premier League and stay in the Champions League as well."

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