Police in Las Vegas have reopened a rape investigation into Cristiano Ronaldo after his accuser claimed she was breaking a non-disclosure agreement.

Kathryn Mayorga, a former model, claims the footballer raped her in a hotel penthouse suite in the city in 2009. Ronaldo has denied the allegation.

Ms Mayorga, 34, who lives in Las Vegas, is now suing Ronaldo to void a $375,000 settlement she alleges she was coerced into signing to keep quiet.

The lawsuit, which details her claim that the Juventus player attacked her in June 2009, was filed in a 32-page complaint filed in Clark County District Court, Nevada.

Ms Mayorga's lawsuit states she reported the alleged assault to the Las Vegas police the same day and underwent an examination at a local hospital.

The Las Vegas Metropolitan Police Department said it had responded to a call alleging a sexual assault on June 13, 2009 and confirmed it has now reopened the case.

When Ms Mayorga's allegations came to light last week Ronaldo dismissed the reports as "fake news" during a live chat on Instagram.

"What they said today, fake - fake news," the 33-year-old star of the Portuguese national football team said in a post that was later deleted.