The Portuguese superstar allegedly knowingly diverted income through the British Virgin Islands.
Cristiano Ronaldo has strongly denied allegations he defrauded the Spanish tax office of £12.9m.
The statement, released via his representatives, was in response to a tax fraud lawsuit being filed against the 32-year-old Real Madrid star on Tuesday.
Real Madrid took a similar stance in backing their player and said they had “full confidence” in him.
In a statement they said: “Real Madrid CF shows their full confidence in our player Cristiano Ronaldo, who we understand has acted in accordance with the legality regarding compliance with their tax obligations.
Barcelona superstar, and Ronaldo’s long-term rival, Lionel Messi was sentenced to 22 months in prison for a €4.1m fraud, but avoided jail by paying a fine and agreeing to probation.