Wenger said: "I believe that we had a bad start and something was not right on the psychological side of the team. We lost a little confidence at the start of the season. And if we had beaten Hull at home we would have been top of the League. Maybe we were a bit too complacent. But we learnt because we are a young side and since then we have been remarkably consistent.
"Before the season I knew there would be a hangover from the disappointment of last campaign. We did fight very hard but I believe as well that we had to rebuild the midfield.
"It was not only those psychological reasons. We had to find a balance again because we lost Hleb, Rosicky and Flamini. We lost three or four midfielders, we did not have Arshavin yet and we did not expect not to have Rosicky."