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OG Larry Allen

The San Francisco Chronicle reports that guard Larry Allen sprained his knee in the first quarter of the season-opening loss to Arizona on Sunday. According to Nolan it's a knee sprain, but MRI's are still to come. There have been several in-game diagnosed knee sprains that turned out as ACL tears after the MRI. Hopefully it's just the sprain.

Quote: Yahoo

San Francisco left guard Larry Allen is expected to miss at least two games with an injured knee ligament

Doubtful

OT Jonas Jennings
The San Francisco Chronicle writes that tackle Jonas Jennings left the Arizona game briefly due to an ankle injury, but he returned in the second half.

Quote: Yahoo

Jonas Jennings could play for the 49ers on Sunday despite his sprained ankle

Probable

TE Vernon Davis
Davis left Sunday's game against the Cardinals with a hip contusion.

Shawntae Spencer
Spencer is probable with a left hamstring injury.