Reigning world 800m bronze medalist Kipyegon Bett is poised to loose his medal to Briton Kyle Langford in the championships held last year in England.
Bett, the former world under 20 800m champion has tested positive for the banned blood booster Erythropoeitin (EPO).
If his positive test is confirmed, Bett will join a growing list of Kenya athletes to have flouted anti-doping rules. The Milan marathon winner Lucy Kabuu tested positive for morphine earlier this month. Samuel Kalalei, the winner of Athens marathon last November, also tested positive for EPO on 4 June.
Kenyan-born Bahraini runner Ruth Jebet, the 2016 Rio Olympic 3,000m steeplechase champion, and former Olympic and three-times world 1,500m champion, Asbel Kiprop, were suspended after their samples tested positive for EPO in February.
Other previous high profile Kenyan athletes who failed dope tests are 2016 Olympics marathon winner Jemima Sumgong and former Boston Marathon winner Rita Jeptoo.