I've said it all season and I'm even more certain of it now: If Manchester United are drawn against a big side in Europe (Bayern, PSG, Madrid, Barca) then they will be humiliated over two legs. Not a 3 or 4 nil aggregate score, I'm talking double that. They will be pummelled.
And there is always a chance they could be drawn against Chelsea. Mourinho against Moyes in a two-legged tie? There is only going to be one winner there. They will do well to get past Olympiakos.