Arsene Wenger: "It was a difficult game. We had the best defence in the league and we conceded many goals today.
"Honestly, we could have scored at least six as well, it was a very open game.
"I think we made too many mistakes. Our strength until now was our defensive discipline but that went as the game went on.
"We were in a position where we could see the legs were tired a little bit and we had to run after the score.
"What hurts me more was that we had the opportunity to put Man City at nine points and now they are three points (behind).
"That is very different. That is a team that was not unbeatable today."
Playmaker Mesut Ozil also appeared to head for the dressing room straight after the final whistle without joining his team-mates to applaud the visiting fans.
An argument with team-mate and fellow German Per Mertesacker reportedly ensued but Wenger played down the incident.
Arsene Wenger: "That is the Germans, they will sort that out between themselves. Don't worry.
"I don't want to look for excuses after a defeat like that but it doesn't help".