Arsene Wenger has accused Arsenal of having a weak mentality against Manchester United.
The Gunners fell two goals down inside the opening 12 minutes of the clash at the Emirates, before going on to win 3-1.
Alexandre Lacazette reduced the arrears in the second half, but it was the only goal that Arsenal could muster despite a large amount of clear-cut opportunities.
Wenger believes that Arsenal should have gone on to win the game, despite conceding twice early on.
But he claims that his side were “too on the edge” – and insists that it cost them victory.
“I think we didn’t start well at all at the back and we are guilty of that,” Wenger told the BBC.
“Despite being 2-0 down we should have come back – we had enough chances.
“We produced excellent quality, but were not decisive enough.”
Wenger added: “Psychlogically it was a big blow to go 2-0 down so early on – especially at home. We were too on the edge mentally maybe – you cannot be in a game like that.
“It was a mystery yes (to not score more), but David De Gea was man of the match by a clear mile.
“We played well but there is nothing more frustrating when you have that quality of performance and nothing to show for it at the end.
“The attitude was impeccable until the end. But you cannot make the mistakes we made at the beginning.”