Mikel Arteta slammed Arsenal for an "unacceptable" 2-1 Premier League defeat to Brighton and Hove Albion on Saturday.
The Gunners went ahead at Amex Stadium through a sublime Nicolas Pepe strike but were stunned by goals from Lewis Dunk and Neal Maupay.
Dunk scrambled the ball over the line after a quick Brighton corner before a 95th-minute winner from Maupay, who was involved in an earlier collision that saw Gunners goalkeeper Bernd Leno taken off on a stretcher.
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It was Arsenal's second defeat in a week following their 3-0 loss to Manchester City on Wednesday and Arteta was far from happy with the way they failed to hold onto their earlier advantage.