Duksch is top scorer for Bundesliga 2 side Holstein Kiel, with 11 goals in 20 games this season.
Kiel are currently second in the German top flight, but fear they will struggle to sign Duksch even if they win promotion.
Leeds would not be able to do a deal before the summer due to his loan agreement with St Pauli.
Kiel were the clear frontrunners to sign Duksch permanently but their worries could alert Leeds' interest.
With Pierre-Michel Lasogga set to return to Hamburg at the end of the season, Leeds will need a replacement, and moving for Duksch could be a clever move, providing he can maintain his impressive form.