Paul Pogba took the blame for a Manchester United defeat that leaves them winless in the Premier League at Old Trafford this season.
Pogba gave away the second half penalty that decided the contest and admitted: "We know it's a poor performance. Myself, I cannot give a foul away like this.
"I thought I would touch the ball but I didn't. (I) cost us the goal today with the penalty.
"Like I say, details. We have to do better, the team, myself, it starts with me.I felt like I touched him a bit, I knew I was in the box, I shouldn't have given a penalty away like that.
"Maybe I was a bit out of breath, it made me do this stupid mistake I will learn from that, I'm not the best defensively in the box, I can work on that."
United have now been beaten in three and drawn one of their four home Premier League matches, leaving them 15th in the table.
The hosts struggled to create chances against Arsenal and there was a clear lack of cohesion between midfield and attack.
What did you make of Pogba's performance against Arsenal? Have your say here.
On his side's lacklustre display, Pogba added: "We also need to do more with the ball creating chances.
"We didn't expect to be man for man, but after this we can adapt, we have to find a solution but we didn't. That's why we weren't dangerous with the ball
"But like I say, the team performance needs to be a lot better."
Meanwhile, Ole Gunnar Solskjaer simply put the defeat down to bad day at the office.
He said: "We didn't turn up, especially in the first half. Second half we played better, we never seemed to have to defend too much. But when we did have to, we were too slow and gave away the penalty.”
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