Borussia Dortmund chief Hans-Joachim Watzke has refused to shut the door on a move for Manchester United midfielder Henrikh Mkhitaryan next month.

The Armenia international is being made available for transfer by United after a falling out with manager Jose Mourinho.

Mkhitaryan has been linked with a return to BVB, having left for England 18 months ago.

Asked about the prospect, Watzke said: "I know like no other the economic data of his transfer to Man United. And that's why it's imaginable only with a lot of imagination."

The chief exec's comments are being interpreted in Germany as encouraging United to keep their terms realistic if they wish to negotiate.