Dwain Chambers' coach Remi Korchemny has been indicted on charges relating to distributing steroids to professional athletes by a federal grand jury in San Francisco.
Korchemny, who lists Chambers, Kelli White and Chryste Gaines as three of his star athletes, was named along with Victor Conte, owner of California-based BALCO Laboratories, BALCO vice-president Jim Valente and Greg Anderson, a personal trainer to baseball star Barry Bonds.
The four, who face charges on 42 counts of distributing illegal steroids and human growth hormones, are expected to appear in court on Friday.
The indictment said: "While operating BALCO, Conte and others conspired to distribute performance-enhancing drugs, including anabolic steroids, human growth hormone (HGH), erythropoietin (EPO), modafinil, and various other prescription drugs, to dozens of professional athletes."
Chambers has tested positive for THG while White and Gaines have tested positive for the stimulant modafinil. Chambers, whose hearing into his positive test is expected to be heard towards the end of next week, was not available for comment.
Both his solicitor, Graham Shear, and a spokesman for his agents Stellar refused to comment on the news of Korchemny's indictment.