The Steelers signed Sternberger to a reserve/future contract Tuesday, Teresa Varley of the team's official website reports.
The tight end joined the Steelers' practice squad in November after being released by the Packers earlier in the season, but he wasn't active for any contests. Sternberger will now return to the Steelers in 2022 and look to carve out a greater role heading into his fourth season in the NFL.