Barry Bonds is going ahead with a case against Major League Baseball regarding his claim of collusion by teams that prevented him from obtaining a playing job following the 2007 season, according to sources.

Bonds has long contended that a collusion of owners effectively ended his career following the 2007 season.

According to sources, Bonds is working on a grievance against Major League Baseball regarding the way his career ended. He could potentially file a lawsuit, as well, but he appears to be working with MLB Players Association now, as is allowed by rules, in an effort to address what he sees as an injustice.