For now, he is questionable to return (via the San Francisco 49ers' official Twitter account):
Hunter went down early in the fourth quarter. He was slow getting up and needed assistance to get off the field, as he couldn't put any pressure on his left leg. The dynamic running back may only have the "questionable" tag, but it would be surprising to see him return with the Niners leading by 10 halfway through the fourth quarter.
It's not the worst possible thing that could happen to San Francisco, but Hunter was well on his way to establishing himself as as an extremely useful cog in this offense.
Against the Saints on Sunday, he racked up 28 yards on just four carries, including an impressive 21-yard scamper down the left sideline.
On the season, the second-year pro out of Oklahoma State now has 72 rushes for 371 yards and two touchdowns. He has proven to be the perfect complement to Frank Gore, while showcasing enough talent to step up and anchor the offense if anything should happen to the starter.
With Hunter out, Brandon Jacobs, who saw his first action of the season on Sunday, steps into the backup role. Rookie LaMichael James could also see some playing time, especially if Hunter and kick returner Kyle Williams are both sidelined for an extended period of time.
We'll be sure to keep you updated as more becomes known regarding this situation.