But Ribeiro insists that they will not sell the midfielder for less than his buy-out clause of over £40million.
Ganso has recently been linked with the likes of Internacional and Arsenal.
"Bring the offers, but we won't accept anything less than his buy-out fee," Ribeiro told Globo Esporte.
"The player's will always has to come first. It's pointless to keep an unhappy player. I always respect the player's will. I did that regarding Wesley, Andre, Jonathan, but Santos' rights have to be respected, as per the contracts that were signed."
"The concrete fact is that he has a contract and a buy-out fee," he continued.
"If he doesn't cancel his contract, he has to play. And if he doesn't play well, he'll be benched.
"And if he's benched, he'll never leave, he'll have to stay until 2015 [when his contract expires]."