Speculation that the 'lifelong Leeds fan' would refuse to move to Old Trafford appears misplaced.
Smith told Radio Five Live: "At this stage you can't rule out anything. People always say that Leeds United and Man United are big rivals but next year we are not even going to be in the same division so it's not even a rivalry. I'm not saying I want to walk out of here and go to Man United, but they're a massive club. If you said the same thing to me about Valencia or Juventus, I'd tell you the same answer.
"At this stage of my career, if I want to win trophies and I want to do well, then I've got to move on. If I were 32 I'd stay here, it's as simple as that. But I'm not, I'm 23, I've got a lot of football in me and I'm an ambitious person.''