Kyle Walker was involved in a heated tunnel bust-up with an Arsenal backroom staff member over an apparent handshake snub as the Gunners triumphed over Manchester City 1-0.
Arsenal inflicted Man City's second loss in a row, the first time Pep Guardiola's side have lost back-to-back games in five years.
Tempers were high after the game and Walker and teammate Erling Haaland were seen confronting a group heading towards the tunnel.
The right back squared up to Nicolas Jover, the Arsenal set-piece coach who had worked for the Manchester club between 2019 and 2021, after appearing to ignore Jover's gesture.