Ronaldo and Mourinho are the latest members of the soccer elite to be accused of tax fraud in Spain.
It is indeed Manchester United's best season since Sir Alex Ferguson's departure.
The cases are about the profits made from image rights, not salaries from their clubs.
He has also helped his team to win two La Liga titles after joining it on transfer from Manchester United for a ten record 80 million pounds in 2009.
Gestifute, a Portuguese-based football agency which represents Mourinho and Ronaldo, did not immediately respond to requests for comment.
Of course, it is not just Mendes' clients who have been caught up in these affairs. The prosecutor said Ronaldo used shell company in the Virgin Islands to cheat on his taxes.
Paris Saint-Germain player Angel Di Maria, who admitted to tax fraud during his time with Real Madrid, has been handed a one-year jail term and will pay a £1.76million fine.
The statement also said that Mourinho had received a certificate from the authorities confirming that he was "up to date with all his tax obligations".
While Ronaldo has yet to personally address the issue, his representatives have already denied the allegations and promised to soon show the public some documents that will prove the player's tax papers are clean and honest, according to Reuters.
The accusations against Ronaldo have caused speculation in Portugal and Spain that he is considering leaving the country to play elsewhere.
A statement from the Attorney General's Office confirmed to Press Association Sport that the Madrid Prosecutor's Office had lodged the papers, relating to 2011 and 2012, with the municipal court.
Eight years after the event, Der Spiegel reported that Ronaldo paid "hush money" to make the rape allegation go away, claiming he paid 258,000 euros to have the matter settled out of court. In fact, prison sentences of two years or less are usually suspended in Spain for those without prior infractions.