Cate Campbell, the 100m freestyle world-record holder, will not race at the world championships in July, according to the Australian.
Campbell would join fellow veterans James Magnussen and the Belinda Hocking in bowing out from the world meet in Budapest. Magnussen, a two-time world 100m free champ, is taking a one-year break. Hocking, who swam backstroke at three Olympics, retired.
Madeline Groves, the Rio Olympic 200m butterfly silver medalist, is also not going to compete at worlds, according to the report.
Campbell, 24, has been a mainstay since earning two 2008 Olympic bronze medals at age 16.