Cristiano Ronaldo was absent from Real Madrid training today, sparking suggestions that his injury sustained in mid-week could be serious.
The sight of Cristiano Ronaldo limping off in the latter stages of Real Madrid's 3-0 Champions League win over Borussia Dortmund will have caused concern for Merengues fans and Portuguese supporters alike.
Ronaldo had already done his night's work when he asked to be taken off, equalling the record with his 14th goal of the Champions League campaign, but his discomfort was clear.
Real's talisman has been struggling with pain in his left knee and the club's doctors appear to be patching him up and sending him back out.
With the games coming thick and fast, there must be a chance that a more serious injury could be caused by this treatment of football's most precious commodity.
Coach Carlo Ancelotti tried to shrug off the injury after the game insisting that it was a 'slight knee problem' and insisting it was nothing to worry about.
The pressure of inspiring Real Madrid in a tight La Liga title race while maintaining a Champions League push could take its toll on a half-fit Ronaldo and some critics are suggesting that he is risking a larger injury by continuing to test his knee.
With World Cup stars dropping like flies in the run-up to the competition, Ronaldo should certainly think carefully before he assured Ancelotti he is ready to return to the fray.