Rooney has asked to leave United this summer even though he still has two years on his contract remaining.
Ferguson revealed last week the request had been turned down, and, along with Gary Neville, advised the England forward to get away during the summer, get his head sorted out and return refreshed.
The matter is not quite so simple, as United will not want to allow the 27-year old to drift beyond the summer without some kind of clear vision of his future. However, as Ferguson acknowledged, it is not his problem any more.
"I have not spoken to David about Wayne," said Ferguson.
"I'm sure he will address it when he gets here. I have no idea why Wayne wants to leave, it is not my department. I am no longer interested in that.
"David is going to deal with that and, quite rightly, he wants to deal with it."