Shanahan said Griffin has a Grade 1 sprain of his lateral collateral ligament.
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"We did not know going into the (MRI) if was a Grade 1, 2, or 3," Shanahan said Monday. "So it's a Grade 1, you're hopeful with rehab it gets better very quickly, but we don't know for sure. We'll have to go day by day and evaluate it day by day."