United have worn white socks playing Newcastle for ages now, as far as I remember, so it's not purely a European thing. I'm sure we've worn them in other premiership games too, but can't remember which.
I bet we'll wear white socks against Newcastle and Hull next season.
It is totally inconsistent!
You are right about white socks against Newcastle at home last season but that is not common.....we have played newcastle at home before in black socks....
Last season we wore black away at Sporting and then white at home....Sporting wore the same strip both times!
Away at Dynamo we wore black socks......
So it is not a European thing either!
We wore white socks at Sunderland, Reading and Birmingham away because they have dark socks too......
There must be a decent explanation that is consistent......I just don't know what it is?