I remember watching that game. I was livid, because I couldn't believe that goal was not disallowed.
However, the pass came from Olic, who's pretty small and I think the linesman thought the ball was played back from one of the Fio players. If you watch the replays it's more than possible.
Anyways, it's the only reason I can think of and I'm happy to believe it since I don't buy into the whole conspiracy crap.