The 24-year-old appears to embrace the interest, with Ruhr Nachrichten citing sources close to Timber as saying he can “principally very well imagine” a move to Dortmund and Germany.
However, the reports adds that a final decision on whether BVB will step up their interest in the Dutch international has not yet been made.
Timber’s contract expires this summer, and Ruhr Nachrichten reports that he has rejected several offers to extend his deal in recent months.
Timber has made 14 appearances for Feyenoord this season. He has featured seven times for Netherlands’ senior national team in total.