Premier League Fulham and a host of Championship sides are eyeing Sharp, 25, who has a £3m buy-out clause in his contract.
He added: "I have spoken to the chairman and I knew there was going to be interest. Everyone knows I want to play in the Premier League and hopefully it will come.
"If I feel there is an opportunity to try and get in the Premier League by joining a Championship side I will have to consider it.
"But until the chairman tells me otherwise I'll be doing my best for Doncaster.
"I'm happy here because I'm scoring goals but I don't want to be playing relegation football."