Barcelona forward Neymar has been accused of not paying 63.3 million reais (£10m) in taxes between 2011 and 2013, a charge his father vehemently denies.
The 23-year-old, who joined the Blaugrana in a reported £42m switch from Santos in 2013, has seen assets worth over £31m frozen by Brazil's federal tax agency.
According to a statement by Sao Paulo federal court in Brazil, Neymar failed to declare assets of £3.3m between 2011 and 2013.
He has also been accused of "omitting sources of income from abroad," with Barcelona named as the source of earnings.
Neymar's father, who is also his business manager, has branded the charge unjust, claiming it was based on an "incorrect understanding" of his son's income.
Neymar da Silva Santos said: "Neymar Jr is not a partner in any of those companies, and therefore he cannot declare something he does not own."
"We have done our duty and we are confident that everything will be cleared up in due time."
Neymar's transfer fee has also been a source of contention in the past, with Josep Maria Bartomeu recently admitting the fee had in fact totalled just over £63m after extra payments to the player and his family had been included.