Pablo Ozuna, who plays second base for Triple-A Lehigh Valley, has been suspended 50 games for showing an "elevated testosterone/epitesterone ratio," according to a statement from Major League Baseball.
The elevated ratio is considered a performance-enhancing substance violation of the Minor League Drug Prevention and Treatment Program.
The suspension begins immediately.
Left-hander J.C. Romero rejoined the team on June 3 after serving a 50-game suspension for violating the policy.
Ozuna has played 309 games in the Majors, for the Marlins (2000 and '02), Rockies ('03) and White Sox (2005-07). He signed a Minor League contract with the Phillies on Jan. 22, and has hit .294 with no home runs and 15 RBIs in 187 at-bats this season for the IronPigs.