Bowers suffered a torn Achilles tendon in May.
Bowers was a first-round draft pick in 2011. He started six games last season as a rookie, recording 22 tackles and 1½ sacks.
Lewis, 23, did not appear in a game with the Buccaneers this season. The Bucs picked up Lewis after he was released by the Dallas Cowboys on Oct. 2. He recorded one tackle in three games for the Cowboys.
The Buccaneers head into Thursday night's game with a 2-4 record. After snapping a three-game losing streak against the Kansas City Chiefs two weeks ago, the Bucs lost to the New Orleans Saints, 35-28, last week.
Kickoff is scheduled for 8:20 p.m. ET on the NFL Network.
This story originally appeared on SB Nation.