Jose Mourinho and Cristiano Ronaldo reportedly almost came to blows, with the player having to be held back by his teammates, when an argument escalated in 2013.
Spanish football expert Guillem Balague has published a new book called Cristiano Ronaldo: The Biography, and, in one excerpt, he describes a dressing room bust-up.
Mourinho had apparently urged Ronaldo to track back in a Copa del Rey match against Valencia in 2013, with his side 2-0 up with 10 minutes to play.
He also reprimanded the superstar for taking a throw-in too quickly, leading to Mesut Ozil being unable to control the ball and giving Valencia another chance at goal.
Mourinho had calmed down after the game and approached Ronaldo with the following words: "If they get a goal against us... ", to which the player furiously reacted.
He shouted: "After everything I've done for you, this is how you treat me! How dare you say that to me?!"
Balague recalls the incident, saying: "The dressing room turned deadly silent. Mourinho tried to remain calm. 'I was saying it for the team, because the team needed you to track back.’"
But Ronaldo was not willing to give in and the former Los Blancos boss stepped aside. However, when Mourinho approached the player again soon afterwards, the incident escalated.
"'Just so you know,' (Mourinho) shouted for everybody to hear, 'many think like me here, but don't dare say it, they don't have the balls to tell you.’"
The player had to be held back by his teammates to prevent the pair from going for each other.
Balague went on to explain that many of Ronaldo's teammates had, in fact, asked Mourinho to, either directly or through one of his staff, tell the superstar to defend more.
Do you think Ronaldo defends enough nowadays? Have your say in the comments section below.