Barcelona president Joan Laporta says the club did nothing illegal by employing a company to consult on technical and refereeing issues.
The club has been charged by prosecutors in Spain with corruption over payments made to companies owned by Jose Maria Enriquez Negreira, the former vice-president of Spain's referees' committee, between 2001 and 2018
The charges filed include corruption in sport, corruption in business, false administration and falsification of commercial documents.
Barcelona have always denied buying referees, or trying to influence officials, and Laporta maintained that position at a press conference on Monday morning.
He said: "Throughout its 123-year history, FC Barcelona has always been a model of fair play, both on and off the field. If we have won for so many decades, it has undoubtedly been as a result of talent, effort and knowledge.
"No campaign to discredit us will prevent us from continuing to be an organisation of reference in the world of sports, that is beloved and admired by millions of Catalans and many more millions around the world
