Rosell is sure coach Tito Vilanova rates the player highly and would fully support a bid.
He is quoted by Marca: "Thiago Silva is a player we want - the board as much as the coach. When it comes to him, the price is not an issue.
"We are negotiating with people for whom money is not a factor. And if they're not willing to sit down and talk, we can't do anything.
"It's a matter of the player convincing them to come over here and start negotiating."