An MRI has revealed that San Francisco 49ers cornerback Chris Culliver tore the ACL in his left knee during Thursday's training camp practice.
Ian Rapoport of NFL Network reported the specifics of the injury:
I'm told #49ers CB Chris Culliver tore his ACL today during practice. Terrible. A late MRI revealed the news.— Ian Rapoport (@RapSheet) August 1, 2013