The Samaritano Hospital in Rio de Janeiro released a statement with the news after the 95-year-old Havelange was admitted late on Sunday (March 18).

"His condition is serious and requires close attention," said the statement signed by doctor Joao Mansur Filho.

No other details were released but local media reported that Havelange, who is due to turn 96 in May, was being treated in the coronary care unit with intravenous antibiotics and that the forecast was "not good".

Another bulletin is due to be released today, the hospital said.

Last December Havelange resigned from the International Olympic Committee (IOC) claiming undisclosed health reasons.

The resignation, however, came while he faced a possible suspension for allegedly taking kickbacks from former FIFA marketing partner ISL in the 1990s.

Havelange presided over FIFA from 1974 until 1998, when he was replaced by current President Sepp Blatter.

He remains FIFA's honorary President.

The Brazilian has been out of the spotlight since leaving the IOC in December, just three days before the IOC's Executive Board was preparing to rule on claims that Havelange took a $1 million kickback from World Cup marketing deals while FIFA President.

The case was closed after his resignation, and Havelange avoided punishment that could have seen him suspended or expelled.

Havelange joined the IOC in 1963 and was its oldest member until resigning.

This latest health scares coincides with the decision of Ricardo Teixeira, his former son-in-law, to resign as a member of the FIFA Executive Committee.

He has also claimed health reasons for his decision to step down, which came just a week after he also resigned as President of the Brazilian Football Confederation (CBF) and head of the Organising Committee of the 2014 World Cup.

But Teixeira, who was married to Lúcia Havelange, the daughter of Havelange, for nearly 30 years until they divorced in 1997, is also heavily implicated in a series of corruption scandals, including ISL.

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