The accusation from Erwin Koeman comes just a week after El Mundo published details of Lionel Messi's current contract from leaks allegedly inside Barca.
Erwin is in regular contact with his brother and told Voetbal International: "He is totally focused on Barça.
"And it's the only thing he thinks about.
"We are quite in touch and we talk about the club, the players and the family. And sometimes I advise him."
And that's where Erwin revealed the discomfort that Ronald had in the beginning.
"During the first months, someone from the dressing room leaked the line-ups, but Ronald solved it," he revealed.