The 28-year-old's sample showed traces of an anabolic steroid used by bodybuilders.
Nkosi suffered mental health challenges while playing for the Bulls and disappeared for several weeks in 2022.
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South African 2019 World Cup winner Sbu Nkosi has been banned for three years by World Rugby after testing positive for an anabolic steroid, his franchise the Cheetahs said on Monday.
"Sbu had a World Rugby test in May and his A sample was positive. He has been banned for three years," a Cheetahs official, who requested anonymity as he is not an official spokesman, told AFP.
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