Arteta said: "We have to manage much better. We cannot win with the way we handled the ball on three occasions in deep areas. If you want to be in the quarter-finals you have to beat your opponent and this is what we will have to do at the Emirates now.
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"We lacked threat. We lacked aggression, especially with the ball in the final third. We can do better.
"I think they're a team that's very well-organised defensively and they break your rhythm all the time. There are certain things we will have to do much better, we know what to expect."
He added: "We couldn't even touch anybody because everything was a free kick. We will learn from that, prepare better, and go and do it."