Shawne Merriman's sore calf continues to be an issue for the San Diego Chargers, who on Friday listed their Pro Bowl outside linebacker as doubtful for Sunday's matchup with the Arizona Cardinals.
Merriman hasn't practiced all week. He left the Chargers' loss to the Seattle Seahawks late in the first quarter Sunday and did not return.
Merriman -- who has dealt with various injuries over the past two seasons -- also missed the Chargers' Week 1 game with an Achilles' problem.
Safety Darrell Stuckey (hamstring) and guard Louis Vasquez (knee) are also listed as doubtful for the 1-2 Bolts.
For the Cardinals, linebacker Paris Lenon (pelvis) is listed as questionable. Wideouts Steve Breaston (knee) and Early Doucet (groin) are both out.
For a complete list of injuries, visit NFL.com's injury report page.