Manchester United manager Erik ten Hag said his team made "unacceptable" errors and showed they still have a "way to go" to be considered a top side during their 3-2 defeat at Arsenal.
Eddie Nketiah's 90th minute goal sealed victory for the Premier League leaders and left United in fourth position, 11 points adrift of Mikel Arteta's side.
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Nketiah also scored Arsenal's opener, with Bukayo Saka netting the other goal for the home side, but United manager Ten Hag said that mistakes contributed to all three goals that his team conceded.