Cubs manager Dusty Baker will testify in the Mitchell investigation into steroid use in baseball, and said he assumed he was called because of his relationships with Barry Bonds and Sammy Sosa. Baker managed Bonds with the Giants and had Sosa with the Cubs. Former Senate Majority Leader George Mitchell was appointed by commissioner Bud Selig to look into the steroids problem. "I don't have any choice," Baker said Thursday, where the Brewers beat the Cubs 8-6. "I was already scheduled to (testify) Aug. 2 and for whatever reason, it was canceled. All I know is I didn't schedule it. I didn't cancel it."