Major League Baseball will launch an investigation into alleged past steroid by players, including slugger Barry Bonds, according to reports.
Bonds is one of several players expected to be investigated
Former US senate majority leader George Mitchell is expected to lead the probe.
Performance enhancing drugs were not officially banned until after the 2002 season and Bonds has denied ever knowingly using any drugs.
But there has been increasing pressure on MLB to deal with the steroid issue, especially between 1998 to 2002.
Two recent books - Game Of Shadows by two San Francisco Chronicle reporters and Love Me, Hate Me: Barry Bonds And The Making Of An Antihero by Jeff Pearlman - have accused Bonds of using steroids.
MLB also faces questions from the United States Congress regarding the issue.
The organisation has yet to confirm the investigation but the New York Times reported in its Wednesday editions that commissioner Bud Selig was on the verge of making it public.