Mikel Arteta admitted last night’s defeat was a big blow after an encouraging start to his reign at the Emirates.
The Spanish boss said he hoped his team could go all the way in the Europa League and earn a place in next season’s Champions League.
He said: “It hurts, big time.
“We had a lot of hope in this competition. It was a great way for us to be able to go to Europe and it is a very beautiful competition to try to win.
“I think we did a lot of positive things in the game. I think we created enough chances to win the game, but if you concede two set-pieces again in a tie like this, then you put yourself in big trouble.”