Arsenal boss Mikel Arteta told Sky Sports: "Without conceding much we lost the game on two key moments.
"We reacted really well. We dominated the game. We created enough chances at least to not lose. We hit the bar. We don’t have the luck.
"We are in a big fight. We lost against Burnley without them having a shot on target, and now we lose because of a couple of chances.
"It’s really difficult when you play a team who are defending low and wasting time. We make it difficult for ourselves conceding the first goal.
"I think we had 15 shots but only two on target. We need to improve our rate, that’s the reality.
"We need to generate more to win football matches. When it comes to small details, the other team wants it more.
"The boys are absolutely still fighting. They’re hurt right now."