Mainoo is still a valued player at Manchester United, but the arrival of Amorim has led to fewer opportunities for the England international.
In a recent press conference, Amorim took responsibility for Mainoo's limited playing time, explaining that the team's new system, which features two midfielders, can be difficult for young players to adapt to.
Amorim said that Mainoo is still part of the team and is training hard, making him a potential option for future games.