Amorim has made his wishes known to the club recently that he needs funds to make player purchases. In an article I read he sent clear warning to the management of the club that if Anthony must leave there must be a good replacement for him. Honestly I think it is time for the club management to work in cooperation with Amorim to bring the change desired, Amorim is an ambitious coach and he looks to know what he wants and what he is doing, he should be given benefit of doubt and the finances to make that change happen.
A player leaves, another player can join and it is very normal demand for a head coach. Anthony has several seasons in Manchester United but failed, I can say he failed, to show his best and over years his contributions for them are very limited. If Amorim wants Anthony staying in the club, and has his plans to use this player, I am doubtful that he will succeed with Anthony. The player seems to reach his limit and can not contribute more for the club and perhaps it's better for all if they have agreement for his departure.
When you come to Man United to be the most important part of the club then all the big disasters have greeted him since the first day. Anyone whether a player or a coach will have the same risk, it is difficult to develop, financial support is sometimes not easy to get and Amorim seems to show signs of stress. See the difference in his facial expression when he was still at Sporting and after becoming Man United coach.
Manchester United have many problems, from owners, sport directors, coach and players. All those problems last for many seasons since Sir. Alex Ferguson retirement, and it's unfair to ask for an instant improvement from Ruben Amorim. He needs time and needs to be given more players who match with his favorite tactics and his plan of building a new squad for Manchester United in a next season.