Brazil great Ronaldo is in intensive care in a hospital on the island of Ibiza.
Sources subsequently confirmed the reports to ESPN FC, and later on Sunday the 41-year-old said in a post on his official Twitter account that he is expected to be released shortly.
Diagnosed with pneumonia, Il Fenomeno was then transferred to a private hospital in the ICU of the Policlinical Nuestra Senora del Rosario.
The paper also said that Ronaldo was still in intensive care but is making good progress.
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Staff at Can Misses Hospital said they were unable to give out any information for "data protection reasons".
Ronaldo, who rose to global fame in the 1990s, and played for various clubs, including Barcelona, Inter Milan and AC Milan, is widely considered to be one of the best football players of all time.
Pneumonia is swelling of the tissue in one or both lungs and is usually caused by a bacterial infection.
Ronaldo was on holiday in Ibiza, where he owns a home.
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He retired from football in 2011 after a glittering career with Barcelona, Inter Milan and Real Madrid.
In his latter years he battled with overweight because of a thyroid problem.
In total, Ronaldo scored 15 goals at World Cups and won the competition's Golden Boot award for the top scorer on one occasion.
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