The Redskins said an MRI taken after the game was inconclusive, so Griffin flew to Florida on Tuesday for a more detailed examination conducted by orthopedist James Andrews. Andrews will perform the surgery Wednesday.
Griffin, the No. 2 overall pick, was one of several rookie quarterbacks to make an instant impact on the league this season. He set the NFL record for best season passer rating by a rookie QB and led the Redskins to their first NFC East title in 13 years.
But Griffin also had to leave three games early due to injuries — two because of his knee and one because of a concussion — and missed a fourth altogether because of the knee. Shanahan repeatedly said Griffin had clearance from doctors to return to play, but the coach also said he trusted Griffin's own word when deciding that the rookie should continue during Sunday's game — even though Griffin was clearly struggling after reinjuring the knee in the first quarter.
Griffin remained in the game until the fourth quarter, when he hurt the knee again while fielding a bad shotgun snap.