The addition of Carson will give the Bengals some depth in the backfield Sunday against Baltimore with starting running back Jeremy Hill listed as questionable with a knee injury.
Hill did not practice Wednesday or Thursday and was limited Friday.
The only other running backs on the roster are Rex Burkhead, who had a career-high 12 carries for 41 yards Saturday at Houston, and Cedric Peerman.
Carson, an undrafted rookie who played with Ogbuehi at Texas A&M, appeared in all four preseason games, leading the Bengals in rushing yards with 85.
Wide receiver A.J. Green (hamstring) is out, while linebacker Vontaze Burfict (concussion/knee) and tight end Tyler Kroft (knee/ankle) are doubtful after neither player practiced this week.
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