United hold a 2-0 advantage over Roma going into the second leg and look set to face Barcelona, 1-0 winners against Schalke in their opening match.
Responding to a suggestion that his side are the form team in the Champions League, Ferguson said: "I watch games in Europe and see different types of football. That makes it difficult to assess where we are. The best way to assess it is if we get to the final."
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