A statement released on his behalf said he "has not received any notification".
He is said to have defrauded the Spanish government out of £1.14million during his four-year spell at the Bernabeu.
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Prosecutors allege the star player failed to pay €14.8 million in tax due between 2011 and 2014 and "intentionally" misled authorities by declaring €11.5 million in taxable earnings versus a real figure of $43 million.
On Tuesday, Ronaldo was told to appear before a judge for questioning on July 31.
Argentina worldwide Di Maria is accused of failing to pay 1.3m euros to the Spanish tax authorities in 2012-2013 by giving up his image rights to companies based in tax havens, such as Panama.
Ronaldo, through his personal branding agent Jorge Mendes - who also represents Mourinho in offering to public and private organizations the for-profit right to use his image in advertisements - has denied any wrongdoing.
If he were to leave, Ronaldo would likely break the world-record transfer fee for the second time in his career. Mourinho was accused by a state prosecutor of defrauding Spain's Tax Office of $3.7 million.
Mr Mourinho, 54, is accused of two counts of tax fraud - €1.6m in 2011 and €1.7m in 2012.
Under Spanish law prison sentences of less than two years are generally suspended providing there are no previous convictions, meaning Di Maria will avoid any actual jail time. Barcelona's Lionel Messi, Neymar and Javier Mascherano have also had issues with the authorities in the past few years.