According to media reports, Powell was one of five athletes who failed drug tests at the national trials last month in Kingston.
Sherone Simpson, a silver medalist in the women’s 100m at the 2008 Olympics, was one of them, according to a report in Britain’s Daily Telegraph.
The Jamaica Gleaner newspaper claimed the substance taken may have been contained in a food supplement.
“My team and I will try to do everything we can to get this issue dealt with as best as we can,” Simpson told the Gleaner. “Thanks to all who have been supporting me, I really appreciate it at this time.”
Later on Sunday, Powell’s agent, Tara Playfair-Scott, revealed on Twitter that a man who allegedly supplied the supplements had been arrested in Italy.
“He has been detained by Italian law enforcement in conjunction with this matter. The investigations continue,” she wrote.