BERLIN, Aug. 26 -- Borussia Dortmund CEO Hans-Joachim Watzke has called for a valid transfer window compulsory for all European leagues as "that's one of the main tasks for European football clubs shortly."

Though the 55th Bundesliga season is already on its way since mid-August, transfers in Germany are still possible until the end of the month. The 2017 German champion Borussia is about to lose one of its key players as Ousmane Dembele is on his way to join the Spanish side FC Barcelona for up to 147 million euro.

The 20-year-old French is supposed to replace Brazilian striker Neymar Junior who joined Paris St Germain for 222 million euro.

Other European leagues, the Italian or Spanish for instance, have different schedules.

"It might be entertaining for the media - but, it isn't entertaining for the people. At a certain point fans want to know, and need to know, what their team looks like for the new season," the 58-year-old Watzke emphasized.

"We must secure that coaches, fans, and clubs are safe concerning their squad," Watzke said, hoping the transfer-window to close before season kick-off. "Everyone must be aware that clubs can't take this burden for much longer."

Within days season goals and team quality would change. The coaches, having done a lot of preparation work in the pre-season period, are forced to start all over again. That, Watzke stressed, can't be for the sake of football and high quality in sports.

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