I was just idly thinking of those who played for us and the rags.
The first most notable chap was of course the great Billy Meredith. But of those since WW2, I came up with:
D Law
B Kidd
J Gidman
A Kanchelskis
S McIlroy
P Schmeichel
P Beardsley (just one League Cup match for Utd)
P Barnes
W(yn) Davies
C Tevez
There are two others who came to us from OT: Tony Whelan and Peter Bodak, but Whelan played only friendlies for United's first team on tour, and Bodak played no games at all for the rags. (They were both rubbish)
That's quite a lot, but I have probably forgotten someone. First-team appearances only.