I don't think Dortmund are interested in getting a player from us. If they are gonna sell, they want pure hard cash of more than 150 million.
Here's also another thing to note, given our large squad right now, we also need to make sure we sell some unwanted players first - e.g. Abraham - because otherwise, we're gonna end up with an even bigger squad if we can't sell after buying a new player. In Abraham's case, there doesn't seem to be any takers for him at the moment.