Dandy Don says Doucet may be out for up to three weeks. I agree this is a big blow to the team. But unlike Don, I don't think it is season threatening. Lafell will step up, and Byrd and crew will provide the backups. LSU is deep. A couple of games (USC and Tulane) should provide enough experience to allow Lafell or one of the others to step up.
Update: Actually, Coach Miles is worried it's a long term injury as well.