Smith 1 or Smith 2? Singletary said it might just be both.
"It depends on how the game goes," the coach said Tuesday.
Singletary said he has talked to both quarterbacks and insists each will take his share of reps in practice this week to be ready to play.
"It's something that I don't really want to announce right now," Singletary said. "You know, in all honesty, in terms of an advantage or whatever, I just think the only real advantage that we could have is to go there and play well. All the other stuff is the cat-and-mouse stuff, but I just think that it's important for us to prepare well this week and get ready to go."
If the 49ers (5-9) win their final two games, they could finish in a three-way tie with the Rams and Seattle Seahawks and claim the NFC West title -- ending a seven-year playoff drought and making good on team president Jed York's declaration that San Francisco would come back from an 0-5 start to reach the postseason.
Neither quarterback could shed light on the situation Tuesday, considering neither was available -- or even seen, for that matter -- during the hour-long open-locker-room period for media.
Tight end Vernon Davis has previously said it is challenging to prepare each week without knowing who will pass him the ball come game day.
"Singletary calls the shots," Davis said Tuesday. "Whether we like it or not, we have to deal with it. I mean, I've never had a situation like that where we've had to use two quarterbacks in a game. But if you do it, there's nothing I can really say."
Alex Smith started in the previous two games -- a commanding 40-21 win over Seattle on Dec. 12 and an embarrassing 34-7 loss at San Diego last Thursday night -- after a five-game absence.
Yet it was Troy Smith who led the 49ers to a 23-20 overtime victory over St. Louis on Nov. 14, throwing for 356 yards and one touchdown.
Alex Smith was sacked six times against the Chargers and 21 times for 122 lost yards in all this season. He has completed 179 of 298 passes (60.1 percent) for 1,974 yards and 10 touchdowns with 12 interceptions and a 79.2 passer rating. He is set to become a free agent after the season and certainly will be elsewhere in 2011.
Troy Smith, a fourth-year pro, has completed 52.4 percent of his passes with four touchdowns, three interceptions and a rating of 80.2.
The switcheroos are challenging.
"It's been tough. It's pretty much been like that since I've been here," Davis said. "We've brought in several quarterbacks -- using one, using the other. It's definitely difficult, but it's something you have to fight through. We have to fight through adversity, and you have to manage to just overcome certain obstacles and fight through it. So that's what we're doing right now."
So it's anybody's guess what Singletary has in mind, because he has changed his so often.
Rookie right tackle Anthony Davis wasn't about to stir the pot. He said it doesn't matter who plays quarterback.
"The head coach handles the quarterback situations," he said.
The Associated Press contributed to this report.