Having already clinched the signings of Robin van Persie, Alexander Buttner, Shinji Kagawa and Nick Powell, the 18-year-old Chilean forward has signed from Universidad de Chile to become their fifth deal of a busy window for the club.
However, Ferguson has stated that there will be no more players coming into Old Trafford now.
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"We definitely won't be buying anyone else," Ferguson told reporters.
"There is no movement about anyone going the other way."
There was talk that the striker would be loaned back to his former club over the course of the coming campaign, but it now appears as if he's set to join up with the full squad at his new club instead.
After tracking Henriquez for a number of years, Ferguson was pleased to conclude their final signing of the transfer window by bringing in the exciting striker, having been impressed with his form and development over the past few months
"Henriquez is on his way back to Manchester, he had to go back to Chile," he added.
"He came over when he was 15 and 16. We kept in close contact with him and, when he got to 18, it was a matter of whether or not we left him for another year or decided to get him in.
"We have had an option (to sign him) since he was 14 when he played against our youth team.
"He had such a good summer with Chile's Under-20s, that we thought it wasn't worth waiting.
"We may as well do it now. He's quick and a good finisher and he has a terrific physique for a boy of 18."