On Monday, the Steelers released Ta'amau, who was arrested in October on drunk driving charges. Ta'amu cleared waivers, allowing Pittsburgh to put him on the practice squad Wednesday.
Wide receiver David Gilbreath replaced Ta'amau on the Steelers roster on Monday.
The 348-pound lineman was a fourth-round draft pick by the Steelers in the 2012 NFL Draft. Ta'amu played four years at Washington, racking up 57 tackles, 16 1/2 tackles for loss and 7 1/2 sacks.
The October incident wasn't Ta'amu's first DUI. He also had a history while at Washington, which caused his stock to drop in the NFL Draft.
The Steelers are 6-3 after edging the Kansas City Chiefs, 16-13, in overtime on Monday night. Pittsburgh, which lost quarterback Ben Roethlisberger to a sprained throwing shoulder, will host the division-leading Baltimore Ravens on Sunday Night Football this week.