Alex Smith has been medically cleared after concussion tests, but the San Francisco 49ers will move forward with their plan to start Colin Kaepernick on Sunday against the Saints, according to a source.

Jim Harbaugh said Wednesday that the 49ers could change their quarterback from week to week or even during the course of a game.

"If you can't be happy for your teammate's success you're playing the wrong sport. Go play tennis or golf or something," Smith said. "That's ridiculous, I think. That doesn't belong in team sports, in my opinion. It's the quarterback position. It gets a lot of attention. We're going to get talked about."