Robert Griffin III is believed to have a partial tear of his ACL and LCL in his right knee.

Griffin underwent an MRI on Monday.

Griffin suffered a torn ACL in the same knee in 2009 while he was in college at Baylor, and has been playing in recent weeks with a mild sprain of the LCL.

Griffin might have to undergo exploratory surgery to determine the extent of the damage and whether the injuries are new, according to a source.