Ferguson regards Rooney as England's No1.
He said: "He's the (Paul) Gascoigne, the Bobby Charlton. He's the best English player. I spoke to him on Thursday and said, 'You're going to have to go through a bit of **** at the moment'. But, you know, that's the name of the game.
"He's coming to his mature years. He's had a lot of issues this year in terms of illness, injuries and not had a long run of games, but he's still got me 14 goals. He'll end up with 20 goals, no doubt about that."