The Real Madrid forward was forced out of a training session – attended by the media – on Tuesday after collapsing to the floor following a challenge with reserve goalkeeper Kiko Casilla.
Ronaldo was seen throwing a water bottle to the ground in anger as he hobbled off the pitch to the changing rooms. However, the 31-year-old insisted the problem was nothing more than a dead leg.
"I am fine. I had a little problem in training, a dead leg as they say here, but tomorrow [Wednesday] or the next day I will be fine. It was a minor scare, a knock," Ronaldo told the media.
Madrid manager Zinedine Zidane is already without defender Raphael Varane, who has been ruled out of Euro 2016 due to a thigh injury.
