The 31-year-old's agent told local media, "He’s contracted two forms of bugs in hospital. He’s undergone two or three operations over the last two months so ... I mean bad luck. He’s quite sick but that’s the situation."
"It’s serious but it’s not life-threatening," he said.
Thorpe's agent says reports that he will lose his arm are untrue -- but does say, "From a competitive point of view -- he will not be swimming competitively again I don’t think."
Thorpe is a legend in Australia -- winning a total of 9 Olympic medals from the 2000 and 2004 games.