Bush was injured on Sunday against the Rams in St. Louis when he slipped on the sideline concrete at the Edward Jones Dome.
In addition to that, DL Kaleb Ramsey was suspended four games for violating the league's policy on performance enhancing substances.
On Monday, the 49ers traded TE Vernon Davis to the Denver Broncos. That was the only trade made by the team prior to the NFL trade deadline on Tuesday. Other transactions from Monday include the signing of veteran RB Shaun Draughn to the active roster and rookie RB Jarryd Hayne, who the team waived on Saturday, to the practice squad.
The 49ers also announced late Monday that QB Blaine Gabbert would start against the Atlanta Falcons on Sunday instead of QB Colin Kaepernick.
On Tuesday morning, the team signed RB Pierre Thomas, formerly of the New Orleans Saints. That leaves a running back group consisting of Thomas, Draughn, and Kendall Gaskins to play against the Falcons.
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