Ronaldinho, a two-time world player of the year, is accused of using a fake Paraguayan passport to enter the country.
Gilberto Fleitas, the head of the investigations unit of the Paraguayan police, said Ronaldinho and his brother were taken into custody just hours after a judge refused to ratify a prosecutor's proposal for an alternative punishment.
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Ronaldinho was arrested Friday night in a hotel in Asunción, Paraguay's capital, and accused of using false Paraguayan ID documents.
Queiroz said that prosecutors had agreed that the footballer had acted in good faith and the decision by a judge to order their detention was unwarranted.
Although he last played professionally in 2015, Ronaldinho is still hugely popular with global football fans for his skills and showmanship.
With unpaid damages of US$2.1 million (NZ$3.3 million), Ronaldinho's passport was seized, along with that of his brother, to prevent him from travelling.
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Speaking to the Brazilian newspaper Folha de São Paulo, Ronaldinho's lawyer, Adolfo Marín, said: "He didn't know he was committing a crime, because he didn't understand he'd been given false documents; he's stupid".
Ronaldinho's first images as a prisoner in the Paraguayan prison emerged online after the Brazilian footballer was caught with a fake passport.
A police official told local media the pair had been placed in a cell with one other inmate.
Local reports said prosecutors were already seeking information on the tax status of a number of people identified as being involved in the operation to invite Ronaldinho to Paraguay.
According to the inspector leading the investigation, Ronaldinho was given a fake passport by Brazilian businessman Wilmondes Sousa Lira, who has been arrested.
In July 2019, the player reportedly had his Brazilian and Spanish passports confiscated over unpaid taxes and non-payment of fines for illegally building on a nature reserve in Brazil.
He was named FIFA World Player of the year in 2004 and 2005 and won the World Cup with Brazil in 2002 and the Champions League with Barcelona in 2006.
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