49ers wide receiver Michael Crabtree isn't sold on Alex Smith as the team's starting quarterback. Smith, who will become a free agent, is expected to re-sign with San Francisco. Crabtree joined some teammates in workouts for the first time on Monday. When asked by reporters if he thought catching passes from Smith was important to building chemistry, Crabtree responded: "Who's the quarterback?" When told Smith was the likely starter, Crabtree said: "He's the quarterback? I'm just asking." Crabtree told reporters that whoever starts at quarterback for the 49ers would get his support, but he's still not sure who that player will be. "I wish I could tell you that," he told reporters. "I know what you're all scratching at. I wish I could tell you who is going to be the quarterback. I don't know. I don't know. Whoever the quarterback is, I'm 100 percent down with it and I'm ready to go. That's it."