On the eve of a return bout with Celtic in Perth, Miller has spoken out about his decision to leave for one of the world's biggest clubs.
"I hope I don't get stick from the Celtic fans," he said.
"People are entitled to their opinion, that's just the way football is. But I am surprised that I still get a bit of stick.
"It was a great opportunity and while it didn't work out the way I hoped, I have no regrets about leaving Celtic when I did.
"I'm glad I went to United. I've played with some really big clubs since then and I've been delighted at how my career has gone.
"It's pointless thinking of what might have been. It was United and it was impossible to say No."