The Steelers used a failed physical designation, which also has been used by the Miami Dolphins to release Dion Jordan and the Kansas City Chiefs to release Jamaal Charles this offseason.
Pittsburgh signed Green to a four-year, $20 million contract last season and he earned about $6 million of the deal before being released. Parting ways with Green is expected to cost the Steelers $3.5 million in dead money.
In his only season with the Steelers, Green missed 10 games and made two starts. He caught 18 passes for 304 yards and one touchdown while battling an ankle injury and a concussion.
Before joining the Steelers, Green had a concussion history during four seasons with the San Diego Chargers. He also underwent ankle surgery in March 2016.
In five seasons since entering the league as a fourth-round pick in 2012, Green has 95 receptions for 1,391 yards and eight touchdowns in 53 games.
By releasing Green, the remaining tight ends on Pittsburgh's roster are Jesse James, Xavier Grimble and David Johnson.