The 23-year old left-back returned to action in the 0-0 draw with Aston Villa after about six weeks on the sidelines with a thigh injury and although he was delighted to be back, he felt the Gunners needed to be more ruthless in order to get a positive result.
"I think it was more we lacked a little bit of conviction in the final third," he told the club's official website.
"We just have to be a bit more ruthless I think. You can see that we're trying to be creative. I think in this game we had enough chances to score.
"It's frustrating [to get injured] after getting off to a good run. I'm back now. It was just a little blip for me. We've got a busy period coming up and I want to concentrate on staying fit.
"I'm happy to be back playing. Hopefully I can stay fit, get a run of games, get my match fitness and [get] back on track."