Santos playmaker Paulo Henrique Ganso has given the club an ultimatum amid strong interest from Milan.
The 21-year-old Brazil international inspired Santos to a 3-2 victory over Colo Colo in the Copa Libertadores on Thursday.
After the game Ganso told Santos President Luiz Alvaro Ribeiro that he would like to move to Italy as soon as possible.
The Brazil international has been branded a mercenary by Santos fans, who held a protest against his actions after a defeat to Palmeiras.
Milan have already been in contact with Papito Lima, the agent and brother of Ganso.
Third party company DIS, who own 45 per cent of Ganso's contract, have also been sounded out.
La Gazzetta dello Sport understands Ganso's future is tied to Santos' progress in the Copa Libertadores.
Santos have a chance to progress next Wednesday with a win in Paraguay against Cerro Porteno.
However, Neymar, Elano and Ze Eduardo are suspended, so the odds are not stacked in Santos' favour.