Olympic silver medallist long jumper Luvo Manyonga has received a provisional suspension from competition.
The 2017 world champion, who overcame drug addiction earlier in life to reach the top of athletics and win Rio 2016 silver, has been issued a notice of charge for anti-doping whereabouts failures by the world governing body World Athletics.
Its Athletics Integrity Unit explains that a whereabouts failure is recorded when an athlete fails to submit or update information, or has provided inaccurate or insufficient information, about his or her whereabouts for an anti-doping test, or when an athlete correctly provides the information but misses his or her testing window.
Three such failures in a span of 12 months is considered an anti-doping rule violation punishable by a ban of up to two years.
South Africa's Manyonga, who faces that possible sanction, will be ineligible to compete or participate in any athletics activity until his case has been heard. If found guilty, Manyonga would miss the Tokyo 2020 Games for which he is a medal favourite.
The AIU also confirmed a two-year ban for former world junior 800m champion Alfred Kipketer of Kenya due to whereabouts failures.
The 24-year-old, who took part in the Rio 2016 Olympics, was suspended from 26th November 2021, the date of his fourth missed doping test within a 12-month period.