Interesting snipped from BBC
"Ruben Amorim had remained wedded to his preferred three-man defensive formation with wing-backs since his arrival at Manchester United.
But the Portuguese coach changed to a four-at-the-back system for the victory over Newcastle on Boxing Day, before reverting to a back three for subsequent games.
Reports had claimed Christopher Vivell, United's head of recruitment, called on Amorim to adapt his system following a detailed breakdown by Fulham boss Marco Silva of his plan to counter it following the draw between the sides at Craven Cottage in August."