"Three months ago, Leonardo said that Huntelaar would have more opportunity to play," was Oosterveer quoted as saying by Corriere dello Sport.
"And the leadership of the club has always shown confidence in him, reiterating their intention to keep him. But now there's only a few months until the World Cup and it's time to clarify the situation."
The 26-year-old striker joined Milan from Real Madrid last summer, but he has failed to make an impact at the San Siro so far. Huntelaar has scored only two league goals for the Rossoneri.
Huntelaar is continually being linked with a host of clubs, with Manchester United, Arsenal, Tottenham Hotspur, Genoa, Ajax and Twente all believed to be keeping tabs on him.