The €222m man has declared Barca directors not up to the job - just 24 hours after former president Joan Laporta called for the removal of Josep Maria Bartomeu.
"The truth is they make me very sad," said the Brazilian. "I spent four years there and I was very happy.
"At first I was very happy. I spent four beautiful years and I was happy, but with them (the Barcelona board), no.
"For me they are not the people who should be leading Barça. Barça deserves a lot more and everyone knows it.
"I hope things get better for Barça and that they become a team capable of rivaling others."