Real Madrid star Cristiano Ronaldo has denied claims that he spent the night with a Brazilian model two days before competing in the first leg of the Champions League semi-final against Borussia Dortmund.

Andressa Urach, also known as Miss BumBum, claimed that she slept with the Portugal captain, who is in a relationship with Russian model Irina Shayk, at the Hotel Villa Magna 48 hours before Madrid succumbed to a 4-1 defeat at the hands of Dortmund.

"I was informed that The Sun, faithful to its editorial line, will publish an article where it has given voice to a so-called Andressa," Ronaldo wrote on his Twitter page.

"Someone seeking the limelight on my account. And I wonder why this happens one day before a very important game for my team. Deeply outraged by a situation intended, in vain, to affect my personal life.

"I just want to clarify, I was in fact at the Hotel Villa Magna on April 22 giving an interview to Manu Sainz, something the reporter himself is able to corroborate. Everything else is pure fiction and forgery."

Ronaldo and Shayk have been dating since 2010.