He is keen to stay at the club but they reportedly want to sell him to help fund the signing of Cristiano Ronaldo from Manchester United.
"Neither Robinho nor I like the fact that Real Madrid can use him as part exchange in their bid to sign Cristiano Ronaldo," said Ribeiro.
"We don't like this attitude and we want Madrid to start valuing Robinho because at the moment they're not.
"Robinho's priority is to continue at Real Madrid, but he cannot stay in a place in which they don't recognise his talent and at the moment Real Madrid are not doing that and I'm not talking about money.
"I'm referring to the fact that they are undervaluing him in comparison to Cristiano Ronaldo."
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