The Brazilian says he is "90%" certain he is returning to Santos.
The club claim discussions have already taken place, with the sticking point being City's desire for any club which takes Robinho to pay a sizeable proportion of the player's weekly wages, which are well in excess of £100,000.
Robinho told TV Globo on Monday morning: "It's all on the right track. Santos are looking at the duration of my loan. Santos want a year, but City want just six months. It's 90% certain. In two or three days it should be sealed."
Santos president Luis Alvaro Ribeiro has also revealed that the deal struck with City could allow the Barclays Premier League outfit first refusal on talented youngsters Paulo Henrique Ganso and Neymar.
He said: "They want the first choice to buy the two boys. That does not bother us because we will sell the players for the best offer. If City have the conditions to match the offer, they can have the players."