MONDAY, 8:29pm: Bush is done for the year, as Adam Schefter of ESPN.com tweets. Bush will undergo surgery on his torn MCL that will shut him down for the year. His ACL, however, turned out to be okay.
It is believed that he has a torn ACL, reports Ian Rapoport of NFL.com (via Twitter). A torn ACL would end his season, and Bush will have an MRI Monday to confirm the diagnosis.
Bush had only eight carries for 28 yards this season, but was in line for a bigger role in the 49ers offense with starter Carlos Hyde dealing with his own injury issues. The team had waived backup running back Jarryd Hayne earlier this week, promoting Kendall Gaskins from the practice squad to the active roster.
Other than Gaskins and the injured Hyde, Mike Davis is the only other back on the 49ers’ active roster.
If Bush does miss the rest of the season with a torn ACL, it would put a lot of pressure on the 30-year-old runner, who signed with the 49ers after being released from the Lions who are in need of backfield help themselves. Despite getting heavy run as the lead back in Miami and Detroit between 2011 and 2013, he more likely would only carry value as a third-down specialty back if he comes back healthy next season.
The 49ers will likely look to add another running back to the mix this week, either by trade or through free agency. They could also consider bringing Hayne back into the mix.