Arsene Wenger conceded Arsenal's stuttering Premier League title bid had suffered a "major setback" after they lost ground at the top with a shock 1-0 defeat at Stoke.
Jon Walters' second-half penalty handed Stoke a famous win at the Britannia Stadium on Saturday and left the Gunners four points behind Premier League leaders Chelsea in third place.
The north Londoners have now won just once in their last eight trips to Stoke and Wenger admitted it was the worst possible start to what he had branded a season-defining month.
