The future of Kevin Grosskreutz at Borussia Dortmund remains in doubt.

The winger has flirted with Liverpool this year and is becoming increasingly frustrated with the lack of action he's seen this season.

"I want to play football for ten years. England remains a long-term dream of mine. Should I change one day, it will not be a change out of bitterness," sad Grosskreutz. "In fact I will always love Borussia Dortmund."