SANTA CLARA (AP) — Four-time Pro Bowl linebacker Patrick Willis has undergone an MRI exam on his injured right hamstring and his status for Sunday’s game at Arizona is unclear.
Coach Jim Harbaugh says Monday he doesn’t know the severity of Willis’ injury or whether it could sideline him for NFC West champion San Francisco (10-2), which clinched the division with a 26-0 win over the St. Louis Rams on Sunday.
Willis landed awkwardly after missing a tackle on fullback Brit Miller during an 18-yard completion from A.J. Feeley with 4:28 left in the first quarter. Willis was briefly down before being helped off the field by trainers. He watched the rest of the game in a sweat suit.
Willis has 93 tackles, two sacks, a career-best four forced fumbles and an interception.
(Copyright 2011 The Associated Press.)