The Brazil international has repeatedly been linked with a move to Stamford Bridge, with reports claiming the Blues have offered £47.8million.
"The Chelsea offer is big, but it's not that big," Ribeiro told Brazilian website Globoesporte.com.
"Scolari called him up to play a game in Basel, between the Friends of Ronaldo and Friends of Zidane in 2003. Scolari spoke to Robinho and gave him strength."
He continued: "In the meeting (with Chelsea sporting director Frank Arnesen last week) I said that Robinho was at one of the best clubs in the world, he earns a good wage and today he's known worldwide because of Real.
"Madrid is one of the best cities in the world to live in. In other words he has it all.
"The only unpleasant thing is the club's assessment of his value, and he feels undervalued for having become a part of some trade deal."