Giambi testified that he obtained several different steroids from Barry Bonds' personal trainer, Greg Anderson, one of four men indicted by the grand jury probing the Bay Area Laboratory Co-Operative. He said he got the hGH from a gym in Las Vegas.
Tony Serra, Anderson's lawyer, said Anderson "never knowingly provided illegal substances to anyone."
Gene Orza, the chief operating officer of the players' association, declined comment.
Anderson, BALCO founder Victor Conte, BALCO vice president James Valente and track coach Remi Korchemny have pleaded not guilty to charges that include steroid distribution.
In an interview to be shown on ABC's "20/20" on tonight, Conte mocked MLB's drug-testing program.
"Let me tell you the biggest joke of all: I would guesstimate that more than 50 percent of the athletes are taking some form of anabolic steroids," he said.
Giambi was among dozens of elite athletes -- including Bonds, Gary Sheffield and track stars Tim Montgomery and Marion Jones -- who testified before the grand jury last year under a promise of limited immunity from prosecution.
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