Allen (hamstring) remained sidelined at practice Thursday, Lindsey Thiry of ESPN.com reports.
With Allen evidently having had a setback with his left hamstring injury, the wideout's status for Sunday's game against the Falcons is cloudy in the wake of back-to-back missed practices. If Allen is out this weekend, Joshua Palmer (concussion) and DeAndre Carter likely would lead the Chargers' Week 9 receiving corps, with Mike Williams sidelined by an ankle injury.