Trey Lance suffered a left knee sprain in the San Francisco 49ers' 17-10 loss to the Arizona Cardinals on Sunday.
Lance had an MRI on Monday morning and isn't expected to miss much time. The 49ers have a bye this week and won't play again until they meet the Indianapolis Colts on Oct. 24.
"It's not a long-term injury but they did say they won't be able to know until (later)," Kyle Shanahan said. "He'll have to stay here on the bye week and get treatment and everything, so we should have a good idea by the end of the next week whether he has got a chance for Indy or not. If he doesn't, they told me it should be like a one-to-two-week thing but possibly just one."
Shanahan has maintained that Jimmy Garoppolo would return to the starting role once he returns from his right calf injury.