The Manchester rivals are locked at the top of the table on 19 points after only dropping two points each from their first seven games.
United sit currently on top of the pile on goal difference with many pundits tipping the two local rivals to battle it out for the title this term.
Ferguson insists he expected big-spending City to get off to a good start as they look to mount a serious title tilt.
"The impetus City now have - they have a huge squad of players and the financial power to attract some of the best footballers in the world - actually changes the focus of the derby these days."
Sir Alex Ferguson on the Manchester derby
Quotes of the week
"I've said all along that would happen," Ferguson told Inside United.
"They are a good team and they were always going to be there or thereabouts.
"Sergio Aguero was bound to do well, coming into the Premier League, because he is such a goal threat around the penalty box. David Silva is also a very good player.
Why would he be we have been on blistering form! Beat Tottenham, Arsenal and Chelsea on the bounce. 24 goals in 10 games. Flying!
City is falling through. Just wait! Sir Alex has been in the game to long to worry!