According to reports in local newspaper Diario de Ibiza, the 2002 World Cup victor was taken to Can Misses Hospital on Friday evening with chest pains where he was seen by doctors.
Former Real Madrid striker, Ronaldo De Lima, is reportedly in intensive care in an Ibiza hospital, after coming down with pneumonia.
The paper also said that Ronaldo was still in intensive care but is making good progress.
Ronaldo, who was named FIFA's world player of the year three times prior to his retirement from football in 2011, is a regular visitor to Ibiza, where he owns a house. He is thought to have arrived on the island a few days ago before his illness started.
Sources told Diario de Ibiza that Ronaldo was recovering well.
In his latter years he battled with overweight because of a thyroid problem.
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After winning everything there is to win in the game he retired in 2011.
Symptoms - which include a cough and difficulty breathing - can develop suddenly over 24 to 48 hours.
It can be life-threatening, especially among the elderly and those with underlying health conditions.
He picked up the Ballon d'Or award for the best player in the world in 1997 and 2002.
It comes just weeks after the two-time World Cup victor was in Russian Federation to open the 2018 tournament, appearing on screen with the official ball and taking part in a passing routine with a local child.
Here's hoping that he can make a speedy recovery.