Powell, who played collegiately at Colorado from 2012-15, was a participant in the Steelers’ rookie mini-camp before being released on May 9. He will wear No. 39.
Ume-Ezeoke was signed as an undrafted rookie free agent by the Atlanta Falcons in 2015, before being released prior the start of the regular season. Ume-Ezeoke also spent time on the Arizona Cardinals’ roster this offseason. He will wear No. 61.
To make room for Powell and Ume-Ezeoke on the team’s active roster, the Steelers Waived/Injured running back Brandon Johnson and center Quinton Schooley.