If we're looking at that calibre of striker then I wouldn't mind having a look at Mitrovic. Only 25, has a presence in the box and could be just what we need short term.
As a squad and depth CF. Mitrovic is a ideal suit. And his age is ideal too. Not the best CF out there, but Mitrovic is really good in everything. Both in the air and ground. And Mitrovic is a kind of CF it will always be hard and difficult to every defend to handle. Because of his powerful, aggressive and tough style. He always give 100%. A CF you can trust on. And he does has flair and is not so worst with the ball. A regular CF for Serbia where he has score in half of the games and has always been a natural goalscorer.
He does has the character and mentality. Like never say die mentality. And can break his nose to score a goal. Mitrovic again is a tough and aggressive CF in the box to handle.
So i will absolutely recommend him too. And i will easily pay 30 -35 £ mill for him.
Having Rashford, Martial, Greenwood and Mitrovic as CF options are really good and strong. 4 really good CF options. Depend on the quality of the wingers too. Like Sancho as RW and Federico Chiesa as left winger.
Ideal line up
Sancho - Bruno - Chiesa/Martial - Rashford/Mitrovic/Greenwood
or 442
Sancho - Bruno/Pogba - McTom/Fred - Chiesa/Martial + Greenwood/Mitrovic - Rashford/Martial
United definitely need Mitrovic air ability. If the wide have good consistent crosser. It will be big chance he will score.