Already short on nose tackles, the 49ers watched starter Glenn Dorsey go down with an apparent hamstring injury on the Cardinals third offensive series Sunday. Dorsey went down while trying to reach for 199-pound tailback Andre Ellington and immediately began clutching his right hamstring. He is questionable to return.
Second-year player Tony Jerod-Eddie, whose most natural position is defensive end in the team's 3-4 scheme, filled in. But the 49ers already are without Ian Williams, who suffered a broken ankle in Week 2, and may have to find outside help. The team's left defensive end, Ray McDonald, is playing with a torn right biceps tendon.
The 49ers could get rookie Quinton Dial back at practice this week. But defensive coordinator Vic Fangio expressed skepticism about how quickly Dial or any of the other rookies who have yet to practice with the team could get up to speed.
-- Matt Barrows