United impressed with a five-goal win over Wigan on Saturday.
“We can’t worry about these things,” said Ferguson.
“We are not going to kill ourselves because of it, but we’re going to take reminders of it, lessons and experience.
“We all know we’ve got players with great experience at our club who are used to winning trophies over the years.
“We still weren’t prepared for the kind of setback we got on Wednesday. It shouldn’t have happened, but it did.”
