Fabio Vieira was filmed screaming at William Saliba in frustration as footage from Arsenal training emerged online. The duo were being filmed at London Colney as Mikel Arteta prepared the squad for the UEFA Champions League clash against Porto. So, why did Fabio Vieira scream at William Saliba in Arsenal training? Let’s take a look… Fabio Vieira shouts at William SalibaWell, the pair were taking part in a rondo with other Arsenal players – in which the ball must be kept away from one player chasing in the middle. Thanks to a mystery figure counting in the background, we can hear that the Arsen…