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.
Honestly, I don't know the exact reason why Enrique no longer needs Donnarumma in the starting lineup. Although the reason currently circulating is that it doesn't fit with Enrique desired scheme, I don't think that's reasonable considering how good Donnarumma previous performance was and brought PSG many titles. PSG doesn't seem to care much about Donnarumma at the moment, just look at when Gigio was no longer a starter in the first match of the League 1 competition. This proves that Gigio must immediately find a new club before the transfer window closes because what the point of staying if he just a bench warmer.