Fiorentina are reluctant to part with fullback Juan Manuel Vargas.
The Peru international has declared he has interest from Juventus and Real Madrid in the past week.
Corvino says: "Vargas is one of those players, like Sebastien Frey and a few others, who have a clause in his contract, but at the moment I am not thinking of selling him and he did not tell me he wants to leave.
"Besides, Fiorentina are not a supermarket. We will remain strong if we keep our best players. The dream is to come back into the top four."