Pollack, a former first-round draft pick, suffered a serious neck injury in the second game of the season against the Cleveland Browns in 2006. He played in 16 career games in two seasons and recorded 4½ sacks.
"David has expressed to me that I believe ... he's headed [into] retirement," Lewis said. "He is not completely comfortable medically where he has been given an opportunity ... to play football. We know the quality of person [he is] and he has a bright future no matter what he chooses to do."
Pollack has expressed interest in getting into coaching, Lewis said. Pollack also worked on SEC football broadcasts last season.
