Garnacho, an Argentina international winger, is set to return to Old Trafford with Chelsea.
According to reports, Amorim had become frustrated with Garnacho's behavior and felt that he was not a team player.
Additionally, Amorim was reportedly tired of Garnacho's social media activities, which he believed were not in line with the club's values.
Senior United players, including Harry Maguire and Bruno Fernandes, attempted to mediate and repair the relationship between Amorim and Garnacho, but Garnacho did not seem interested in improving their relationship.