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Steelers first-round pick David DeCastro has a torn medial collateral ligament but the team is unsure whether he tore his anterior cruciate ligament. DeCastro is scheduled to undergo an MRI at lunchtime to determine the severity of the injury. If it's just a torn MCL, he would be expected to miss about half of this season. If it's a torn MCL and ACL he likely would miss the full season.

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