Corriere della sera, Football Italia and other Italian media are writing that Donnarumma is unhappy because Messi said that Navas has to be the first choice keeper.
The news also says that Messi is a part of South American clan at Psg who sticks together all the time, and they all prefer their boy Navas.
Hard to tell whether it is true but Messi was always closest with South American guys like Neymar, Suarez and rumors for years were indicating that he wanted Argentinian Lautaro, Argentinan Dybala, Argentinian CB who moved to Tottenham, that random Argentinian striker who played at a WC 2018, Pinto was there to be his friend, we have just signed Aguero to keep Messi happy.
Messi's defenders will say that it is a total bullshit.
The other side will say: not surprising at all, fits perfectly in the whole rumor-story about a little dictator.