The Packers are also looking to sign away Broncos practice squad WR Tavarres King. A recent 5th rounder out of Georgia, he showed promise in training camp and in preseason, but due to their deep WR corps, the Broncos cut him and put him on their practice squad. He's a longshot, but with Rodgers throwing to him, he might be relevant.
I haven't looked at his plays in the preseason but he must have played well enough for the Packers to only carry 4 WR's. You would think a team that passes as much as the Packers would have to have faith in their #4 WR.
Even if they signed King, he would need time to learn the playbook. You would think someone from their own practice squad would have a higher likelihood of impact... or even the team bringing back Ross.