Lance was a limited participant in Friday's practice due to a groin injury and is listed as questionable for Sunday's game against the Bills.
Lance presumably tweaked his groin during Friday's practice, given that he wasn't listed on the injury report Wednesday nor Thursday. DJ Uiagalelei is the Chargers' QB on the practice squad, and he would likely serve as the team's backup to Justin Herbert if Lance is not cleared to play against Buffalo.