The former fourth-round pick's suspension is currently under appeal.
The news of Bryant's suspension comes days after center Maurkice Pouncey experienced a broken bone in his ankle.
After not playing in the first six games of his rookie season last year, Bryant caught 26 passes for 549 total yards and eight touchdowns down the stretch for the Steelers.
Pittsburgh opens the 2015 season on Sept. 10 at New England.
- Kayla Lombardo