By Joe Brewin

Arsène Wenger admits mistakes in defence cost his side all three points against Norwich at Emirates Stadium on Saturday.

Steve Morison’s late equaliser cancelled out Robin van Persie’s second-half brace to leave the Gunners’ hopes of automatic qualification for the Champions League in the balance.

Arsenal had fought hard to turn around the visitors’ 2-1 half-time lead and Wenger concedes that his side’s lapses at the back proved decisive.

“I feel mentally we were not switched on to play a game of that stature in the first half,” he told Arsenal Player.

“We were absolutely poor defensively today, which is quite surprising because recently we have been solid.

“We came back into the game, we had a great second half, but again we made the mistakes at the back which were absolutely unbelievable. It is a big disappointment because when you come back into the game like we did from 2-1 and then give a goal away in the way that we did.

“At the back everybody was absolutely horrendous for the third goal. It is just not acceptable. We can play them offside with a bit of intelligence and I feel that the way we conceded the goal was just unexplainable.”

Watch the full interview with the boss on Arsenal Player now.

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 7 May 2012