The controversy surrounding the transfer of Brazilian Neymar to Barcelona is "unfair" because the Spanish champion has done nothing wrong, club president Josep Maria Bartomeu said on Monday.

Barcelona has been accused of tax fraud by Spanish authorities after it came to light the striker's transfer fee, initially disclosed as 57.1 million euros ($79 million), was in fact closer to 90 million euros.

"Barca is a very well known brand name in the world and we have to take care of the good image of our club," Bartomeu said.