There are some thoughts but Rashford will have to go left again. Martial is a very strong 9 who will protect us and can combine and score.
Imagining he is our #9, we need players who can communicate with him technically. And a lot of our technical players a la Bruno and Rashford are technical but in a very unpredictable way, meaning that the ball doesn't stick, they try dangerous things, they take risk... they are needed, they make the team completely unpredictable, but they can lose possession during offensive phases.
So we need players who can basically ensure we don't lose the ball during the offensive transitions, since Ole wants us to play in pockets to move the ball quickly. And this is where we need a player like Mata. Now Mata is technically gifted but he's getting older. If we had Sancho, that would have been our long term answer. We do not, and frankly speaking, I don't think we will get him now. Because if we need to mold another Mata, we have a couple of ball magnet players who are going to stabilize our attack the way he does coming up very soon: the Pellistri dude, Amad Diallo, and even Mejbri... those guys can all learn from Mata what we need from them. And then we will have it.
I think this is shown by the first disallowed goal scored by Bruno. Mata was offside but look what he does. He's basically fixating the whole opposition before giving a composed pass to Bruno that opens up the goal. That's his role, that's what we need him for. We have a lot of crazy technicians but we need people like Mata who can calm down the pass, and make everything else tick.
Now in the case of that specific goal, Martial could have been there. But we still need a Mata to help him, because one person is not enough.