The Gunners were thumped 3-1 on Wednesday night.
Iwobi said, "Obviously it's a tough one to take. It's not a good result when we want to get in the top four, but we can't dwell on it, we have to move on to the next game.
"Yeah, it's [disappointing] but last time we had back-to-back [league] defeats, we went on an amazing run. We'll look at that as a confidence boost, go back to training and just focus on the next game."
On their poor away form, he added: "I don't know what it is, I can't pinpoint it, otherwise we would have just sorted it out. I think it's a mental thing - we just have to keep on fighting, keep on being together as a team and just focus again on the next game."