Running back Frank Gore is expected to miss at least two games after an MRI examination showed a right ankle strain and a right hind foot sprain.
The 49ers have games the next two weeks against the St. Louis Rams and Atlanta Falcons, followed by their Oct 18 bye week. The first game for which Gore might be available is Oct. 25 against the Houston Texans.
Rookie Glen Coffee, a third-round draft pick from Alabama, will take over the every-down duties. And, right now, the 49ers do no appear inclined to promote Kory Sheets from the practice squad. It looks as if they're sticking with Coffee and Michael Robinson.
This is the reason they invested in Coffee. The 49ers do not want the 49ers to dramatically change their offensive approach if Gore was unavailable.