Mizzou safety Jarrell Harrison was injured in Tuesday morning's practice and later missed the afternoon practice.
Mizzou spokesman Chad Moller confirmed the injury news.
An MRI exam was done this afternoon and the test revealed torn meniscus, which will require surgery. Team Trainer Rex Sharp indicated that the surgery could be performed by Team Physician Pat Smith as early as this Friday, and that if all goes well, Harrison could be back in time for the Sept. 4 season opener against Illinois.
So it looks the battle at safety won't be much of a battle over the next three weeks. Junior Kenji Jackson more than likely enters the season as the starter.