Reflecting on Robinho's wonderful finish against Arsenal last week, Ferguson said: "You think £32million, is he worth it?
"When he scores goals like that you have to say yes.
"The audacity and composure were absolutely brilliant. Maybe he is not in the game a lot but he produces these moments that others cannot do."
Yet, for all Robinho's success, Ferguson is also aware City boss Mark Hughes will have had to devote plenty of attention to the Brazilian in an effort to ensure his transition to life in England has been as smooth as possible.
"It is always the same, whether a player costs £32million or £2million," said Ferguson.
"When they come from another country you have a job to do in terms of how they interact with other players, adapt to a different culture and learn the language.
"There are a lot of things you have to do with these players, not just from Brazil and Argentina but all countries.
"That is what I find is fantastic about today's game. I have 17 different nationalities at this club. It is a fantastic challenge to deal with the situation and make sure there is harmony in the place."