The Packers hosted Blacknall for a workout Monday, Rob Demovsky of ESPN.com reports.
Blacknall was waived by the Dolphins with an injury settlement Aug. 25. He's now returned to full health and is searching for a depth role elsewhere in the league, though it remains to be seen whether he'll get a chance with the Packers. Blacknall appeared in one game for the Raiders in 2018 but was not targeted.