
Maybe this is related to their thinking of selling Rashford? However he is playing as LW the most this season. Therefore I don't know why they plan to sign a 3rd striker for the team.

If they are thinking of parting ways with Zirkzee or Hojlund then I would understand. But I didn't see any rumour about these players to leave either.
I believe Vlahovic is more talented than both of those two though.

But if I were in their shoes, I would sign a LW instead of parting ways with Rashford. A really reliable one I mean.
I doubt speculations about Manchester United wanting to sign Dusan Vlahovic are true. Rasmus Højlund is relatively younger than him and try signing dusan Vlahovic will disrupt Højlund’s progress. I think Manchester United will have to shift their attention to signing wingers and probably left backs and bring a perfect replacement for Bruno Fernandes.