Lads you all seem to be forgetting something. One of the first names in the Manchester United mid field is Phil Neville. If Miller can't displace Phil Neville then he wont amount to much anyway. A move to Man United now is the perfect move for him, he's going to get a fair bit of playing time to establish himself and he will devolop alot more at Man U then at Celtic, no matter how much he plays. Also, in about a year or two, Keane will retire, which will really open up a gap for him, and even know Keanes not playing every week.