Mayorga also claims she went to the police and had photographs taken of her injuries at a hospital, but later agreed to an out-of-court settlement because she felt "terrified of retaliation" and was anxious about "being publicly humiliated." .
Her lawyers are now seeking to find the declared non-disclosure agreement void.
Information surfaced on Friday through the German publication, in which American woman Kathryn Mayorga alleged that the five-time Ballon d'Or victor raped her in a hotel room in Las Vegas nine years ago.
Later, Ronaldo allegedly paid her $375,000 (€320,000) as a settlement.
In her lawsuit, Mayorga states that she did go to local authorities that same day, but did not name her alleged attacker until several weeks later after numerous police interviews.
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Ronaldo denied the allegations, calling it "fake news".
Daily Star Online has contacted Dr Schertz asking him about the rape allegations made by Ms Mayorga and the legal action Ronaldo is planning to take in response.
His lawyers have said they will seek "compensation for moral damages" on his behalf in response to the "inadmissible" and "unlawful" reports. In her lawsuit, Kathryn accuses Cristiano of battery for sodomizing her, while also accusing him and his team members of "intentional infliction of emotional distress, coercion and fraud, and abuse of a vulnerable person".
"After he assaulted me, he wouldn't let me leave again", Mayorga told Der Spiegel.
The magazine's Deputy Editor-in-Chief, Alfred Weinzierl, told Reuters that Der Spiegel had repeatedly written to Ronaldo's management and lawyers about the allegations before publishing its report. She took notice of comments about the athlete's desirability, she told the magazine, including statements to the effect of, "As if Ronaldo even needs to rape a woman".