Barcelona are considering taking legal action following incendiary comments made by Real Madrid president Florentino Pérez on Tuesday.
Pérez revealed to the media that his club is preparing a 500-page dossier to submit to UEFA regarding the Negreira case.
The Madrid supremo reiterated that the Negreira case, which saw more than €7 million ($8.2m) of payments made by Barça to former referees' committee vice president José María Enríquez Negreira between 2001 and 2018, is "the greatest scandal in history."
Pérez added: "It's a case that remains unresolved and is still ongoing. Because it's not just Madrid that's harmed and Barça that's benefited -- although Barça has always benefited."
Barcelona, who beat Real Madrid 2-0 on Sunday in the Clásico at the Spotify Camp Nou to clinch the LaLiga title, were quick to respond.
Real Madrid boss Alvaro Arbeloa backs president Florentino Perez after he called for an election in a press conference.
"Regarding the press conference held by the Real Madrid president, Florentino Pérez, we inform that our legal department is carefully examining his declarations and accusations," a club statement said. "They are currently being analysed and the steps to be taken are being assessed. When considered opportune, any positions and decisions that have been adopted will be notified."
Pérez, 79, addressed the media following a turbulent season for his club, which has now gone two seasons without a major trophy for the first time in 20 years.
Instead of accepting his team's errors, Pérez issued a scathing attack against a section of Spanish media and referees, while announcing elections.
- Messi and the forgotten tape: Oral history of Argentina's race vs. Spain to recruit young Barcelona star
- Sources: Paris Saint-Germain eye move for Julián Álvarez amid Barcelona, Arsenal interest
- Barcelona coach Flick: Waving Palestine flag Yamal's call
"We've come up empty-handed," Pérez said. "And I've been here for I don't know how many seasons, yet I've only won seven European Cups and seven leagues -- which could have been 14 if they hadn't been stolen from me. We've made a video about the 18 points they've taken away from us this season. I just can't keep quiet about it.
"I have to speak out because, as president of Madrid, I cannot allow people in the media to take control just because we didn't win a league or a Champions [League] this year. They've already forgotten that two years ago I won a league and a Champions League. Now they're saying Madrid is in ruins, chaos... But it's the most prestigious club in the world, and everyone recognises that.
"I want to put an end to this anti-Madridista sentiment that has taken hold in some sectors. We are going to call elections."
