United scouts have watched the 17 year-old striker in the past two games, while Juve had scouts in attendance on Sunday to see him score twice in victory over Valerenga.
Juve are now readying a €5m offer to convince Molde to sell.
Asked about the interest, Haaland stated: "I don't think much about it. I'm just thinking of playing well, which I did today (Sunday)."
"He is probably not the world's biggest Manchester United fan, but if they come to the door, there are not many who say no to that," smiled Molde coach Ole Gunnar Solskjaer, with a clear reference to father Alf Inge's playing career in Leeds United and Manchester City.