Cristiano Ronaldo receives treatment from medical staff [Source: Fox Sports]
Forward Cristiano Ronaldo went off injured as Portugal drew their European Championship qualifier 1-all against Serbia.
Ronaldo pulled up with what appeared to be a hamstring injury when sprinting after the ball and was substituted in the 31st minute.
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Euro 2016 winners Portugal have begun their defense with two draws at home.
They were held to a scoreless draw by Ukraine on Friday.
In other matches, England beat Montenegro 5-1.
France beat Iceland 4-0.
Ukraine defeated Luxembourg 2-1, Albania won against Andorra 3-0 and Turkey defeated Moldova 4-0.
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