The 19-year-old has been linked with a move to Premier League side Chelsea in recent weeks.
“Milan must decide what they want to do, we are enthusiastic about Chelsea’s interest for the player, but the final decision is up to them,” Gilmar Veloz said in the The Times.
“Pato has a contract with Milan but, if they meet Chelsea’s asking price, we’re open to a move.
“Right now, however, all I can say is that I cannot guarantee that Pato will remain at Milan. It’s up to the club.”