An MRI has revealed cartilage damage behind Lance Berkman's left knee. Berkman suffered the injury while compensating for his surgically-repaired right knee, which he aggravated earlier this month. The 36-year-old insists that he'll return to play later this season, though it's looking likely that he won't be activated until next month. Berkman will be a part-time player down the stretch, as Allen Craig has settled in as the everyday first baseman, and he likely wouldn't be able to hold up physically in an everyday role, anyway.