Rumor has it that Galatasaray are very much interested in signing Donnarumma this summer, but I believe since Manchester City have also shown interest in Donnarumma this season, Donnarumma will prefer a move to Manchester City over Galatasary. Ederson will not accept to be a second choice goalkeeper if Manchester City signs Donnarumma, so it is expected Manchester City will sell Ederson to another club.
Some popular sports news channels reported the opposite of your comments. It has been reported that Gianluigi Donnarumma will be moving to Manchester City. Personal terms have been agreed, and City might be giving €30 million as a transfer fee. Meanwhile, 31-year-old Ederson has expressed his desire to move to the Turkish club Galatasaray. And the Turkish side has concluded with his earnings, but they are offering City about €15 million. Since the club already has good goalkeepers like Stefan Ortega and new signing James Trafford. So the Brazilian would have to leave. Within a few weeks, we might end up seeing these two deals materialise.
I've never heard anything about Donnarumma being linked to Galatasaray and what I know is that Galatasaray are very interested in signing Ederson. Manchester City have already replaced Ederson when they have signed James Trafford as the goalie. However, when Donnarumma stated that he wanted to leave PSG, Man City turned out to be interested in recruiting him, but that would only happen if Ederson really left. Galatasaray has already made an offer, and they are still in talks with Man City, so it seems like it's just a matter of time before the deal happens.
Alexander Isak still wants only join Liverpool.
I don't know how Newcastle plan to resolve this Isak problem. I still maintain that it is of no use keeping a player who has openly said he no longer wants to play for the club. Even if they don't sell Isak this summer, they will prolly sell him in January, so why not sell him now and make over €100m from Liverpool. No player is ever bigger than the club, so rather than allow a player's action to affect the rest of the team, better to be done with him and concentrate on the personnel you have.
I think Newcastle made a mistake by not offloading Isak sooner. After all, why keep someone who no longer wants to play for the team, as it will only complicate the situation. If only Newcastle had sold him sooner, they would have had a significant amount of funds, which would have given them a lot of flexibility in the transfer window, and they might have been able to get the players they wanted.