Arsenal boss Arsene Wenger bemoaned Arsenal's 1-0 away defeat to Cologne as a game lost to one shot.
The Gunners are safely through to the next round of the Europa League.
And the Frenchman was delighted with the mental strength showed by his players.
"We had a lot of possession," he said after the game.
"We lost the game to one shot, basically. It was a very nice penalty that we have to take on board. It was honestly not a penalty at all.
"We missed a little bit of the accuracy in our passing in the final third that is required to score more goals. We had plenty of dangerous situations but we always missed a little something to finish our chances.
"I must also say that Cologne defended with spirit, with commitment and overall the crowd was absolutely fantastic for them.
"I must say that the attitude was good. It took us some time to inject some pace into the game. In the second half, it was much quicker. The pitch was a little handicapped tonight, and the players were because of it, but I cannot fault the preparation or the concentration of the players."
