Auburn will start Clint Moseley at quarterback Saturday at No. 1 LSU.
Coach Gene Chizik said Tuesday that Moseley is replacing Barrett Trotter, who started the first seven games.
The sophomore took over for the 19th-ranked Tigers in the second half of last week's victory over Florida. He has attempted only nine career passes, completing four of them.
"We spent the last 48 hours really evaluating and looking again at what we think is the best for Auburn..." Chizik said. "It doesn't mean Barrett Trotter doesn't get his chance to win, it just means that we've been struggling offensively the last few weeks. I don't think that's a secret."
Chizik called Trotter "a warrior" when asked if he'd had any problems do to injury. "He's taken hits, he's gotten back up. I'm not going to say he's not beat up; I think our whole football team is," Chizik said before adding, "Physically, he's fine."
READ THE QUESTION AND ANSWER SEGMENT from Tuesday's news conference.
Chizik says he and Moseley talked for about 90 minutes a few weeks ago about the backup's situation and the importance of being ready. Since then, the coach says "he's really tried to elevate his game in terms of really preparing like a starter."
"I feel like we need a spark there," Chizik said. "I feel like in the second half of the Florida game, Clint came in and gave us somewhat of a spark when we needed it. I think he's earned the right for the opportunity to start, so he'll be starting in Baton Rouge Saturday."
LSU had been preparing for two Auburn quarterbacks until Auburn made the decision Tuesday.
This marks the third straight week LSU will face a team with a new starting quarterback. Florida and Tennessee had to switch starters after injuries.