Although he has added the varied attacking talents of Carlos Tevez, Anderson and Nani to a squad which already contains Wayne Rooney and was the most prolific in the Premier League last term, Ferguson knows Saha offers something different.
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Quick, strong, excellent in the air and blessed with shooting power in both feet, Saha's only major weakness is his appearance record.
Ferguson: "Louis is a different type of player to anyone else I have at the club.
"If you look at last season, he had already scored 12 goals up to the point where he got his injury in December. If he had stayed fit, he might have got us 30.
"He has already come on against Sunderland and scored an important goal for us and changed it for us against Sporting on Wednesday at a point when Wayne was starting to tire.
"If Louis stays fit, we have a big, big chance this year."