I think Manchester united should also focus on their attack. The likes of Rashford and Garnacho can't take them anywhere. Those players are too inconsistent to do anything great in Manchester United. They also need a striker because the 2 strikers hey have are not good enough.
A lot needs to be done to mak that team competitive. Manchester United have a team that can compete for the top 6 but they don't have a team to compete against the Elite in Europe.
Garnacho doesn't know how to play in a team, he is too egoistic to achieve good results with him. And as for Rashford, he does not show a stable game, and recently it is clear that he has some grievances against Amorim, who may leave him out of the squad for the game. And considering that Amorim will want to get several players from Sporting to Manchester United, Garnacho and Rashford will be better off finding other teams where they will be valued more.