The actor, who plays Sheriff Andy Bellefleur on the HBO series, revealed that his character will continue to struggle with his addiction to vampire blood.
"It's just going to get worse and worse," Bauer told The Huffington Post. "In this season Andy has fallen into the proverbial hole, and I think he won't be able to get out unless someone gives him a hand."
Bauer went on to admit that he empathises with the troubled sheriff.
"One of the deals with Andy is that he can't stand the way he feels at any given time," he said. "He locks onto things like authority, like his position, to make him feel better - and things like boos, and in this season it's vampire blood. That's a transaction that I understand very well, so it's an easy place for me to go to."
Bauer previously promised that season four of True Blood is "an especially great year for the fans", describing it as an ideal combination of the highlights from previous seasons of the HBO series.
True Blood creator Alan Ball recently revealed that Andy's sister Portia (Courtney Ford) will still be keen on continuing her relationship with Bill (Stephen Moyer), despite discovering that the two are distantly related.
True Blood airs Sundays at 9pm on HBO.