The Pittsburgh Steelers carried five inside linebackers into the 2018 regular season, and remained at that number for most of the year, though they did eventually release undrafted rookie Matthew Thomas and finished the year with four. At the moment, however, only three of those linebackers are under contract.
Those would be Vince Williams, the starting buck who is under a long-term contract; Jon Bostic, a six-year veteran free agent signing in 2018 who began in a starting role but played less late in the year, under contract through 2019; and Tyler Matakevich, a career special teams player who is in the final year of his rookie deal.