DonAK
President of FC Barcelona
IF the rumours to be trusted,Messi informed them in July. Before any big loss.
Bartomeu when Messi tried to inform him he was going to leave at the end of the season.
BTW, July is when all major outlets in Spain were reporting that Messi had cut of all communication lines with Barca when it came to his contract renewal and they were thinking it was a sign he was leaving in 2021. Might have been when he informed them he was leaving now, if it's true of course.
https://en.as.com/en/2020/07/03/football/1593731866_731747.html