"The newspapers talk about him as if he is a transfer target for the big clubs, but he is one of Cagliari's most representative players," Renzo Contratto told TeleRadioStereo.
"Even if President Massimo Cellino is willing to sell, it would take a considerable economic sacrifice to sign him, especially as he has fully shown his quality.
"I would therefore rule out a loan, even a paid one with option to buy. If he were to leave, it would take the right offer.
"Milan? They are looking for defenders and Astori could suit their needs, even though I don't believe there are any negotiations going on right now."