However, United have now missed five penalties this season following Rooney's second-half spot kick gaffe, and Ferguson is disappointed with his side's troubles from 12 yards out.
"I don't think it's one of these things, I think we have to improve on that," said Ferguson.
"There was talk about the boy [Rickie] Lambert at Southampton who has scored 31 out of 31. That's what penalty kick taking is all about.
"There are several great examples over the years. [Matt] Le Tissier [got] 47 out of 48. There was a player (Johnny Hubbard) in Scotland [who] played for Rangers [who scored] 57 in a row. Your penalty kick is your opportunity to take an advantage - whether it's a foul or a handball - of scoring a goal."
United will now host Fulham in the fourth round of the FA Cup later this month.