Ruben Amorim has been blasted across social media after footage emerged of him using coaching magnets in the dugout during Manchester United's defeat to Grimsby Town in the second round of the Carabao Cup on Wednesday night.
Amorim, 40, looked to be experimenting with tactics on the bench in the 62nd minute of the Red Devils' defeat to the League Two side - with Grimsby winning 12-11 on penalties despite two late goals from United's Bryan Mbeumo and Harry Maguire.
It marked the first time in the club's 147-year history that they had lost to opposition in the fourth tier of English football.