Cristiano Ronaldo has denied that his alleged nickname for Lionel Messi behind closed doors is 'motherf

The Real Madrid forward was accused of regularly referring to his Barcelona counterpart by the name in Guillem Balague's book, MESSI, but Ronaldo insists it is untrue.

'News is circulating that I allegedly made offending remarks regarding Lionel Messi,' the 29-year-old wrote on his official Facebook page. 

VIDEO Scroll down to watch Barcelona's Lionel Messi insist he does not compete with Real Madrid's Cristiano Ronaldo 

Real Madrid star Cristiano Ronaldo has denied that his nickname for Barcelona's Lionel Messi behind closed doors is 'motherf******'

Ronaldo has been training with Portugal ahead of their Euro 2016 qualifying match against Armenia on Friday night

The Real Madrid forward insists he does not refer to his Barcelona counterpart as 'motherf******' and that he respects his Ballon d'Or rival