Portuguese star Cristiano Ronaldo, captain of the Al-Nasr team, will undergo a thorough medical examination on Monday in a private hospital in Riyadh, in order to check on the injury he sustained during his team's match against Al-Fayha on Saturday evening in the Saudi Professional League, according to special sources for «Asharq Al-Awsat».Ronaldo left the match before the end after feeling muscle pain. Al-Nasr's medical staff conducted initial examinations immediately after the match, and the initial examinations showed pain in the posterior muscle, awaiting the results of the medical examination scheduled for Monday to accurately determine the nature of the injury.The results of the tests are expected to reveal the type of injury and the duration of treatment required, and based on them, the rehabilitation program that the player will undergo will be determined, in addition to the possible duration of his absence from participating with Al-Nasr during the coming period.It is noteworthy that Al-Nasr was able to defeat Al-Fayhaa by three goals to one in the match that brought together the two teams on Saturday evening, as a result of which it topped the Saudi Professional League standings.