The Germany international has been heavily linked with a move to the Premier league and the Dortmund press are pressing for answers with just one year left to run on his current contract.
Both Arsenal and Manchester United have maintained an interest in Gundogan over the past year while the Bundesliga Champions Bayern Munich are also understood to be weighing up a €30 million move for the 24-year-old.
Bayern have a habit of signing Dortmund’s best players in recent years and are now weighing up a €30 million bid for the Germany international.
Bayern have signed Mario Gotze and Robert Lewandowski from Dortmund in recent years and could add Gundogan to that list.
Dortmund have been reluctant to let go of their star man whose contract comes to an end in 2016 and offered a contract extension until 2019 worth €6.5 million per-season.