The 49ers signed Judon to the practice squad Monday.
The 49ers already have four edge players on injured reserve, and Nick Bosa (calf) and Romello Height (hand) are banged up, leaving the team's depth especially thin. Judon turned 34 years old last month and failed to record a single sack across 14 regular-season games with the Dolphins and Bills last season. He doesn't appear to have a whole lot left in the tank.