Former Brazil striker Ronald is reportedly in intensive care with pneumonia in Ibiza, a Spanish island.
The 41-year-old Brazilian is said to have been diagnosed with the illness after being rushed to Can Misses Hospital on Friday evening.
According to a newspaper, Diario de Ibiza, Ronaldo asked for a transfer to a private hospital called Clinica Nuestra Señora del Rosario just before midnight the same day and is making positive progress.
The Brazilian, regarded as one of the world’s best-ever players, owns a house in Ibiza and is a regular visitor to the island.
He is believed to have arrived in Ibiza for a summer break a few days ago.