If they still insist on wanting him, Manchester United can sell him for a good transfer fee. With the income from there, they can add another player to the team. Because Marcus Rashford is now a player who is damaging Manchester United. He had good times in the past, but every player was good at one time in the past, what matters is whether it is consistent or not. Rashford is not consistent. Maybe the Portuguese coach does not want him in the team.
Maybe the sign is starting to appear. Amorim did not name Garnacho and Rashford in the last EPL match against Man City. This is Amorim's bold decision. So far I have seen Man United always make them the first choice. Amorim said Rasford and Garnacho were not at their best in training and he decided not to take them to Etihad. But it seems that the decision is quite right, Man United can bring 3 points home. This condition may be what makes the rumors even bigger. But if these two players don't have any improvement I think selling them is also a good option.