2. Pernell McPhee, EDGE
If Joey Bosa is going to miss more than one week then the Chargers are best off signing someone for depth to the roster. The Bolts are already pretty thin at EDGE with no depth behind Chris Rumph, so having a veteran like Pernell McPhee would help even when Bosa is back and playing on the active roster.
The options in free agency are obviously not going to be tremendous during the season but McPhee would add a nice veteran presence that at least gives the Chargers someone they can rely on in a pass-rush rotation.
Plus, there are connections between McPhee and the LA Chargers. McPhee, who last played for the Baltimore Ravens, spent three seasons with the Chicago Bears from 2015 through 2017. His last season in Chicago was Staley's first season. This alone could lead the Chargers to look into him, as Staley has seemingly valued past connections in the additions he has made.
McPhee admittedly was not very good last season but he did have a solid year in 2020 for the Baltimore Ravens when he served more as an outside linebacker. In 2020, he played solid run defense on the edge while generating 35 total pressures in 296 pass-rushing snaps (per PFF). Not elite numbers, but not bad for someone you are signing in-season.
The Chargers should already have more EDGE depth and there really isn't anyone on the practice squad that is blowing anyone away. A vet might be the best route.