Arsenal boss Arsene Wenger admits the sale of Robin van Persie to Manchester United last summer destabilised the club.
Van Persie went on to help United regain the Barclays Premier League title from Manchester City while Arsenal had to settle for fourth place.
Speaking at the club's AGM, Wenger said: "We lost Van Persie, created a lot of unrest and destabilised team. But from November to May team showed fantastic mental strength."
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