Bartomeu, who hired Koeman last August but resigned in October to avoid facing a vote of no-confidence, was detained on Monday along with CEO Oscar Grau in a probe related to allegations of improper management and business corruption.
The statement said Bartomeu, president between 2014 and 2020, and his former adviser Jaume Masferrer, had made use of their right not to give a statement in court and the judge had agreed to their provisional release.