The prosecutor's office in Madrid is currently investigating the transfer fee the club paid for the star in the summer of 2013.
The reported sum was €57.1 million [£48m], but allegations have since surfaced that the club had failed to declare a further €37.9m [£30m], which was given to a company close to the Neymar family.
"We are quiet on the Neymar case," Bartomeu was quoted as saying by AS. "It was an interpretation of the prosecutor.
"In July we will have statements from Rosell, the father of Neymar, and from [general director] Toni Rossich on behalf of the club.
"The truth of the Neymar event will benefit us. But it does not remove the possibility of a complaint.
"We will explain the same thing. We have published the exact figures but what we want is a judge or a prosecutor to interpret them the same as us.
"When I say the truth through Toni Rossich, that will be the truth and is the truth."