Kenyan 1500m runner Elijah Manangoi has been provisionally suspended, according to the Athletics Integrity Unit. Manangoi, the 1500m world champion, has a personal best of 3:28.80 in the event. He made one appearance this year, running a 2000m race in Nairobi as part of the Impossible Games.

"News of my suspension by the AIU for 3 missed tests is really devastating for me and I'm trying to get my head round it," a statement on Manangoi's Facebook page said. 

"What I can say is each of the missed tests happened during 2019, my case has nothing to do with prohibited substances and I've always competed as a clean athlete."

Several high-profile athletes have been charged with whereabouts violations in 2020. 

In June, 2019 world champions Salwa Eid Naser and Christian Coleman were both suspended. Both are awaiting rulings. Last week, Deajah Stevens received an 18-month ban for whereabouts violations that will keep her out of the Tokyo Olympics.

In July, Gabby Thomas was cleared in a whereabouts case after she provided new evidence about an alleged missed test.

Three whereabouts failures in a 12-month period can result in a suspension of up to two years.