Ronaldo is reportedly in intensive care in an Ibiza hospital after coming down with pneumonia.
The outlet reported that the former footballer was admitted to Can Misses Hospital on Friday evening, before he requested a transfer to a private hospital called Clinica Nuestra Señora del Rosario that same evening.
Hospital sources have said he is still in intensive care but making good progress.
Here's hoping he pulls through.
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Ronaldo is believed to have arrived in Ibiza for a summer holiday a few days ago before he fell sick.
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.
He scored 62 goals in 98 games for Brazil, as well as being a prolific scorer for some of Europe's elite clubs.
He won two La Liga titles with Real, the UEFA Cup with Inter and lifted the World Cup in 1994 and 2002 with Brazil, also reaching the tournament's final in 1998.
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Pneumonia is swelling of the tissue in one or both lungs and is usually caused by a bacterial infection.
Considered one of the best strikers of his generation, Ronaldo played for a host of top European clubs including Real Madrid, Inter Milan and Barcelona.
It can be life-threatening, especially among the elderly and those with underlying health conditions.
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.
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