Not saying there is an obligation to do so. As I've written in another post Barca will and should expect to get shafted this late in the window, Dortmund would probably happily accept 100m euros for him in June or thereabouts.
Just hope the recent fee and wage inflation also will affect Dortmund. What is annoying with Dortmund is that they themselves expect to get players for a packet of crisps and a food stamp.
Clubs that sell to Dortmund in the future would be wise to add on a huge sell-on fee, like 40%.
bullshit. Dortmund just paid 30m for Schürrle(!), 25m for a broken Götze and 15m for Rode last summer.
Even if Dortmund sell Dembele for 200m right now, they would weaken their squad. Who should they buy this late into the window with their money to replace him? If i was in charge for them, i wouldn't sell at all. This lad has still 4 years left on his contract, they can still get good money for him in 2 years and have more time to find good replacements. Right now they would have to overpay massively for much lower quality.