Cristiano Ronaldo set alarm bells ringing for Portugal on Thursday as he failed to complete his side�s training session and left the pitch in Campinas with a large ice pack on his left knee.
The Real Madrid forward has been struggling with tendinosis but returned to action for 66 minutes in Portugal�s 5-1 friendly win over Ireland on Tuesday.
After that, the 29-year-old told reporters he was �99.9 per cent fit�, but participated only in stretching with his team-mates on Thursday and left the pitch with his knee in an ice pack after signing autographs for fans.
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