"The international federation (IAAF) informed SEGAS that Piyi Devetzi re-tested positive on a sample taken in 2007," SEGAS said in a statement.
"Following this development the federation has opened disciplinary proceedings against her."
Devetzi retired in 2009 after the IAAF banned her for two years following her refusal to undergo a doping test while training in Ukraine.
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She won an Olympic silver medal in Athens in 2004 and a bronze in Beijing four years later.
Devetzi also claimed a world championship bronze in Osaka, Japan in 2008.
(Writing by Graham Wood; Editing by Tony Jimenez)
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