With less than a year to run on his current deal, talks over a new contract have long broken down.
This week, Donnarumma has been left at home in Paris as PSG prepare for tonight's Super Cup against Tottenham. New signing Lucas Chevalier has already been earmarked by coach Luis Enrique as the Italian's replacement.
In a testy statement, Donnarumma declared last night on social media: "To the special Paris fans, From the first day I arrived, I gave everything – on and off the pitch – to earn my place and defend the goal of Paris Saint-Germain.
"Unfortunately, someone has decided that I can no longer be part of the group and contribute to the team’s success.
"I am disappointed and disheartened. I hope to have the opportunity to look the fans at the Parc des Princes in the eyes one more time and say goodbye as it should be done.
"If that doesn’t happen, I want you to know that your support and affection mean the world to me, and I will never forget it. I will always carry with me the memory of all the emotions, the magical nights, and of you, who made me feel at home.
"To my teammates – my second family – thank you for every battle, every laugh, every moment we shared. You will always be my brothers. Playing for this club and living in this city has been an immense honour. Thank you, Paris."
A move to England is being mooted for Donnarumma, where Manchester City, Manchester United and Chelsea have all made contact in recent weeks.
I want a different goalkeeper
Before tonight's Super Cup, Enrique explained leaving Donnarumma in Paris.
“Donnarumma is out of the squad as it’s my own decision. I am 100 per cent responsible," said Enrique. "I want a different kind of goalkeeper and I made this decision. Gigio is one of the best goalkeepers in the whole world.
“The life of a top-level footballer, and the same goes for us coaches, is this: it wasn’t an easy decision but I take full responsibility for it. On the other hand, if these choices were easy, anyone could make them.”