The Facts: The 49ers placed Bush on injured reserve because of Sunday's knee accident on St. Louis' concrete surface along the sideline.

Diehards Line: The move was expected after the veteran halfback injureed his knee. The team signed veteran free agents Pierre Thomas and Shaun Draughn to add immediate depth to a backfield with Carlos Hyde unable to play last week with a stress fracture to his foot and with Mike Davis suffering a factured hand against the Rams.