The transfer window hasn’t even started yet and we’re already witnessing major changes happening in several large clubs. The biggest of these changes is Gianluigi Donnarumma’s refusal of a contract extension. Though many expected the keeper to remain at Milan, just like Buffon stayed at Juventus despite going through some rough and tough times. The keeper, however, has had other thoughts as he looks set to leave considering that his contract will expire next month. AC Milan’s CEO, Marco Fassone,…