Gala have been in talks with Ederson's agent over contract terms and have already had a first offer rejected by City.
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Asked about moving for PSG keeper Gigio Donnarumma, Okan said: "Donnarumma is extraordinary, but we have to be realistic.
"Ederson remains the first concrete option, even if negotiations with City are still ongoing."
TMW says Gala have agreed personal terms with Ederson over a €6m-a-year deal, while their last offer to City was €10m.