The Athletics Integrity Unit says Belarusian high jumper Dzmitry Nabokau has been provisionally suspended after testing positive for a diuretic that helps hide the use of other drugs.
The 23-year-old Nabokau competed at the world track championships in Doha, Qatar, last month. He cleared 2.26 meters in the qualifying round and was eliminated on a count back.
The AIU says Nabokau tested positive for furosemide, which can be used as a masking agent. It was not stated where the sample was given.
Nabokau won a world junior silver medal in 2014 and was eliminated in qualifying at the 2016 Rio de Janeiro Olympics. His lifetime best jump is 2.36 meters.