Arsenal skipper Mikel Arteta was visibly upset after their Champions League defeat to Borussia Dortmund.
Ciro Immobile and Pierre-Emerick Aubameyang struck either side of half-time and the German club would have been more emphatic victors than 2-0 but for the reflexes of Wojciech Szczesny and their own wastefulness.
Arteta told Sky Sports 5: "We faced a tough side in one of the most difficult stadiums in Europe, we knew that from the start.
"They put us under pressure, it was very sloppy from us to concede the goal with 20 seconds to go in the first half from a long throw from the other side of the pitch and after you are 1-0 down, it's very difficult. They are very quick on the break and we didn't perform well enough tonight."
The 32-year-old Spaniard was aware of the pace Dortmund had up front which Arsenal failed to cope with.
He added: "They put a lot of pace and a lot of pressure up front. When they play here and when you (are familiar) - we've been playing here every year in the Champions League - but we couldn't cope with that and we gave the ball away too many times in our own half in difficult positions."
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