You are absolutely correct, because if Manchester United didn't find another midfielder, I don't think even Osimhen will perform well if they sign him to the Club, Without a strong midfielder, strikers can't achieve anything because it is the help of midfielders that helps clubs to win matches in the league. You will notice that Manchester City are not winning games like they used to because Rodri, the paying midfielder, is injured, which is why you will see Manchester City are strongly to win many matches in the competition.
If Amorim will try and looks for strikers and midfielders when the transfer market opens and tries to buy players, Manchester United will be as strong as they were before, competing in the League table to win trophies in competition. If only Bruno, I can claim that is still crucial midfield for Manchester United, now without him, it is very tough for them to win matches. Amorim should hunt for answers before it is too late for him because payers can be injured at any time, and if you can find a better replacement for him, he will lead you to lose points in the competition.
The problem faced by Manchester United is indeed very complicated because even though they have looked for alternatives to replace the coach, Manchester United's performance has not been consistent. Bruno is an irreplaceable player at the moment and sometimes he does not play well as expected by the coach, but the problem is that there is no better replacement than him at the moment. Manchester United's attack line is actually good, it's just that there is no support from other players so they are unable to score goals. Players like Garnaco and some others also often show selfishness and they don't pass to their teammates at the right position so that opportunities to score goals are wasted.
Amorim needs to see the weak side of his players and there needs to be a big change from every game so he knows where the weaknesses are that need to be fixed. There are many Manchester United players now that are not the standard he wants so he is still trying to rotate every game.