Andreu Subies, the vice-president of the Royal Spanish Football Federation (RFEF), has been arrested on money laundering charges.
A former president of the Catalan Football Federation, Subies joined the RFEF in May to work with Luis Rubiales' team but has now been detained as part of a police project called 'Operation Soule'.
While the Spanish Civil Guard are now searching a number of offices in Catalonia, the RFEF has issued a statement expressing its "utmost respect for the legal actions" and "commitment to transparency."
They have also indicated that they will conduct their own investigation into the allegations alongside Operation Soule.