"It's just a fracture nothing bad, we're being very cautious right now," Phelps, who retired after last year's London Olympics, said in an interview posted on the website of swimming governing body FINA (www.fina.org) on Sunday.
"So I guess it is true you can get hurt on the golf course," added the 28-year-old Baltimore native, who won 18 Olympic golds and 26 world championship titles in his glittering career. He did not elaborate on how he sustained the fracture.
The swimming events started earlier on Sunday and Phelps said he was looking forward to being a spectator rather than a competitor for the first time.
"It's kind of weird being on this side of everything," he said.
"It is a little strange to be out and about in public and dressed up but I am excited to be able to watch some of the swimming this week and not be I guess as nervous.
"This is going to be my first meet seeing people swim since I retired so it's going to be very different and I'm not sure how I'm going to react but I'm looking forward to it."
(Reporting by Iain Rogers, editing by Clare Fallon)
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