Michael Cohen of The Athletic was first on the report, and it was later confirmed by the team that Koppenhaver was being placed on the reserve/retired list.
Koppenhaver finished his collegiate career with the Duke Blue Devils as the school's all-time leader in touchdown receptions by a tight end with 12. He played in 41 games, hauling in 49 passes for 431 yards. He graduated with a degree in psychology and is currently pursuing a master's degree in management studies.
There was little likelihood that Koppenhaver would crack the Packers' final roster in September at a loaded tight end position.