Harry Maguire admits Manchester United deserved to lose to Arsenal in their Premier League meeting on New Year's Day.
"I think we are disappointed to go in 2-0 down at half-time because we should have weathered the storm," Maguire told MUTV.
"Especially don't concede from a set-play. When we are not playing great, do the basics well and doing the basics is heading the ball out of your box and keeping the ball out of your net.
"We knew going in at 2-0 at half-time the next goal was crucial, we had chances in the second-half, but we deserved to lose, we weren't good enough. We have got to improve for next week."