SANTA CLARA, Calif. -- As expected, San Francisco nose tackle Glenn Dorsey is listed as questionable to play at Tennessee on Sunday.Dorsey injured his hamstring last week in the win against Arizona. The odds are Dorsey is rested and Tony Jerod-Eddie starts. Coach Jim Harbaugh said a player will be added to the 53-man roster Saturday, and it will likely either be Quinton Dial (off the PUP list) or Mike Purcell (off the practice squad). The 49ers need depth at nose tackle.