Given what we've seen in the preseason, the Niners don't currently have a viable backup option.
"Right now, in terms of a backup quarterback, it's simple: It's whoever doesn't turn the ball over," Harbaugh said, per the Bay Area News Group. "They're turning the ball over. All of them have. There's nobody to elevate."
To be fair, San Francisco has been outscored 57-3 in two preseason games, so it's not just the backup signal-callers who have played poorly. Harbaugh acknowledged something is "definitely off" with his team.
"This is going to be an important week for us," Harbaugh said. "We need to make decisions on who we're playing with. We're not going to keep experimenting. We've got to tighten this down fast."