The Borussia Dortmund forward’s representatives have been travelling across Europe, with super agent Mino Raiola trying to broker a deal.
United hold a definite interest in the 20-year-old, with manager Ole Gunnar Solskjaer keeping in touch with his compatriot from their time together at Molde.
Solskjer has told fans he will remain tight-lipped on any potential deals this summer, as the club navigate the summer window.
He said: “Who we’re interested in and who we can go for and who we will go for, of course I’m not going to comment on that.
“Hopefully, I’ll sit here with players nobody has written about and thought we were not going to go to. We conduct our recruitment business and scouting the players we are interested in, we do it the right way, I hope and feel.”