Heerenveen look set to sell midfielder Michael Bradley at the end of the season.

The 20-year-old American has not accepted a new contract offer from the club, who therefore want to cash in before his current deal expires in 2009.

"Michael is ambitious and wants to broaden his horizons," technical director Yme Kuiper told Voetbal International magazine. "If we want to get any money for him, we must sell him in the summer."

Bradley has put himself in the shop window this season by scoring seven goals in 18 Eredivisie games. German side Hamburg are expected to lead the chase for his signature.