German-born Ghanaian defender Stephan Ambrosius has turned down a contract offer from Hamburg, according to Hamburger Morgenpost.
The 21-year-old's current deal is set to expire at the end of the season and could leave the German side for free next summer.
English Premier League side Leeds United are reportedly interested in signing Ambrosius in the winter transfer window.
The highly-rated defender has made five appearances in the league for Hamburg already this season.
Stephan Ambrosius broke into the Hamburg first team last season and has since been a key cog of the team.