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Former AL MVP Jason Giambi and his brother, Jeremy Giambi, are scheduled to testify later Tuesday. The brothers have both admitted to using performance-enhancing drugs they obtained from Greg Anderson.

Other athletes who are on the government’s witness list include several former teammates of Bonds: Armando Rios, Benito Santiago, Bobby Estalella and Marvin Benard.

All the players except Jason Giambi, who is with the Colorado Rockies, have retired.

Prosecutors hope to use the players’ testimony to bolster their position that Bonds knowingly used steroids obtained from Anderson.