Barcelona president Sandro Rosell says they deserve praise for how open they are to the media.

Rosell describes Barca as the "most transparent club" in the game.

"Barca is more than a club and will be for its entire history," he told reporters.

"At Barca you know everything, we are probably the world's most transparent club. Lluis Lainz [author of this book] has helped make this so, explaining the stories that have taken place behind closed doors."