Staff at both hospitals refused to give an update on the 41-year-old's health for privacy reasons when contacted by Diario de Ibiza.
Former Brazil and Real Madrid great Ronaldo Nazario is now in hospital in Ibiza recovering from pneumonia, local media said on Sunday.
Ronaldo is said to own property on the Spanish Island and is believed to be visiting on holiday.
He requested to be transferred to private hospital Clinica Nuestra Senora del Rosario later that evening, the newspaper said, and remains in intensive care.
At the time, the Brazilian managed to handle the indisposition humorously with his trademark smile via tweet from his hospital bed saying: "Good morning to all those who began the New Year with dengue".
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They spent more money than us, so in the Premier League we must get used to teams with players of the same quality that we have. I think one defensive mistake and probably the linesman could help him and give a free-kick against Leicester.
No-one at the private hospital Ronaldo is now said to be a patient at could be contacted early on Sunday for comment.
He hit eight goals and scored in every match in Brazil's 2002 World Cup win apart from the quarter-finals en route to lifting the trophy in Japan. He is thought to have arrived on the island a few days ago before his illness started.
At club level, he spent time with Barcelona, Real Madrid, AC Milan and Inter Milan.
In his later years he battled with overweight because of a thyroid problem. Tissue swells, and it can cause coughing and breathing difficulties.