Fener's actual debt is more like €350M, the rest are collaterals for credit. Galatasaray has more actual debt than Fener for example (in the €500M range). 90% of the debt is from the football division which is the largest and very reckless financially. It doesn't matter that much because Erdogan allows Turkish clubs to operate at levels of debt that wouldn't be possible for other clubs. Any Turks correct if I'm wrong.
Thanks for the info