United appointed the Sporting boss as their new manager last week, with Amorim set to start his new role on 11 November.
Interim manager Ruud van Nistelrooy has used the 4-2-3-1 formation favoured by Erik ten Hag during his two matches in charge.
Amorim, who has predominantly used a 3-4-3 formation during his managerial career, masterminded a 4-1 victory against Manchester City in the Champions League on Tuesday.