Cristiano Ronaldo cut short a training session with Portugal on Thursday, leaving the field with an ice pack over his left knee - indicating that his tendinitis may still be bothering the star forward. (Full FIFA World Cup coverage)
Ronaldo trained with the rest of the team for about 15-20 minutes doing physical exercises but then did not take part in the rest of the session with full ball drills.
Instead, he stretched on his own and signed a few shirts for fans before going to sit on the bench. When he left, he had an ice pack over his left knee.
Ronaldo has been bothered by left leg injuries ahead of the World Cup, and was sidelined for two weeks with tendinitis in the knee and a thigh problem.
However, Portugual midfielder Joao Moutinho said there was nothing to worry about concerning Ronaldo's health.
"Ever since he started to train with us he has been 100 percent like the rest of us," Moutinho said. "Everything is fine with him but there is some caution, not only with him. Today many other players were using ice as well. There is nothing to worry about. The ice is normal after training."