Ferguson told Inside United magazine: "We’ve got a club quiz in early December and Ryan Giggs is frantically trying to recruit the two brightest brains in the squad — Dr Steve McNally and assistant head physio Neil Hough — to go up against me."
But when he found out 25-year-old Rooney was enlisted, Ferguson joked: "Come on, we want some competition! Can you believe that?"
He added: "We did one on MUTV last year against Giggsy, Gary Neville and Michael Carrick. They were hopeless!
"This year Giggs has roped Jonny Evans and Wayne Rooney into it.
"To be fair, Jonny Evans is a bright lad. He got something like ten GCSEs, so we’ll have to keep an eye on him."