Today's win means United will play Ecuadorian side Quito in Sunday's final. It will be the last game Patrice Evra is eligible for until 11 January, following the four-match ban imposed on him by an FA panel for violent conduct in the post-match fracas at Chelsea last season.
In their conclusions, which have been made public, the FA blamed Evra for starting the trouble, while also condemning the evidence offered by Ferguson's assistant Mike Phelan, who was described as "unreliable and unimpressive".
"To go through what they have said would take up too much time," said Ferguson. "As I have said before, we are disappointed. I don't think what the FA have done is very clever."