However, the 32-year-old denies any wrongdoing.
Ronaldo made these comments on Instagram on Tuesday, a day after he appeared in a Madrid court in connection with a tax evasion case.
In addition, they say the Real Madrid striker only declared 11.5 million euros of Spanish-related income from 2011 to 2014, while what he really earned during that time was close to 43 million euros.
The agency representing him released a statement later on in which he claimed that he has never hidden anything.
The Portugal captain also told those in attendance that he always filed his tax returns on time and "never had the intention of evading taxes", before finishing up by remarking that his "conscience is clear".
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Accused of having evaded 14.7 million euros ($17.3 million) in tax, he entered and left the court in Pozuelo de Alarcon, a wealthy suburb of Madrid where he lives, via an underground garage to avoid the press. Those that know me, know what I ask my advisors: "that they have everything up to date and properly paid, because I don't want problems".
"I am only here because my name is Cristiano Ronaldo", he told the judge, newspaper El Mundo reported.
As per reports, the prosecutor's office, in a statement, said Ronaldo had knowingly used a "business structure" created in 2010 to hide his income in Spain from his image rights.
Messi and his father Jorge Horacio Messi were handed the jail term last July after they were charged with three counts of tax fraud, which amounted to 4.1 million Euros.
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