The Brazilian has been on loan with Santos since January and has recently made comments which suggest he would prefer to remain in Brazil.
"Robinho will stay in Brazil until the international game and then he will come back here because I need to speak with him," said Mancini.
"I worked with him for one month, then he decided to go back to Brazil. He said he wanted to stay at home so he could prepare to play for Brazil at the World Cup.
"There was no pressure from me but now I must speak with him because it is very difficult for him to stay at Santos."
Whether Robinho's name could crop up in connection with Mancini's attempts to sign Balotelli is a mute point.
"I am still hopeful. We have time but we will not pay too high a price."
The Italian suggested the attempt to get Milner was slightly nearer, although remained vague about the England star as well.