Rooney has previously hinted that he would be keen on becoming United skipper.
Ferguson told The Sun: “It’s difficult for a forward to be captain.
“Eric Cantona was because he was such an influence to young players, they idolised him.
“But normally you look at midfielders or defenders.
“Wayne will always take responsibility, he has a natural desire for that and will always give 100 per cent.”
Fergie believes 23-year-old Rooney will only get better.
He added: “When players reach 25 they play with authority and bring calmness to their game.”
