The Portuguese forward suffered the problem in the final minutes of the match against Villarreal on Wednesday.
In his first test there was cause for optimism, but this final examination will provide the verdict which his coach and teammates have been waiting for.
The concern over Ronaldo has been such that he attended the Ciudad Real Madrid training facility 24 hours earlier than planned.
He underwent an ultrasound which ruled out a major injury in his right hamstring, however, it did indicate that there was some sort of issue.
The assessment will determine what part he can play for Zinedine Zidane’s team in the match next Tuesday.