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.
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.''
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.