If Donnarumma is not going to play there is no way he is going to stay one year on the bench in Paris. Somehow he is going to leave the club, he is in his prime, he was in Milan's line up when he was 16 years old and now he should stay on the bench because Chevalier is playing? No way.
Luis Enrique himself chose Chevalier as part of his strategy this season, so Donnarumma will certainly be a substitute, and if he does, only in select matches.
A top goalkeeper who has made a significant contribution to the team shouldn't be treated like this, and Donnarumma should choose to leave PSG and join another team.
The situation at PSG won't benefit Donnarumma, as Luis Enrique plans to have Chevalier as the mainstay goalkeeper this season.