Harry Maguire admitted that Manchester United "needed to do more" during Sunday's loss to Arsenal while adding that the club will have to "look within" and not make excuses.
United were undone at Old Trafford on Sunday, falling 1-0 to the Gunners thanks to a Pierre-Emerick Aubameyang penalty in the second half.
With the loss, United now sit 15th in the Premier League with seven points through six games, marking the club's worst start since David Moyes was in charge.
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The Red Devils have struggled at Old Trafford so far this season, with Sunday's defeat meaning that United have failed to win any of their opening four top-flight games at home for the first time since 1972-73.