Vidal (neck) returned to practice Wednesday as a limited participant.
Omarion Hampton (DNP - ankle) and Hassan Haskins (LP - head) are also on the injury report, after Vidal and Haskins missed Saturday's loss to Houston. Health won't be the only factor, as Chargers coach Jim Harbaugh already said QB Justin Herbert won't play this Sunday at Denver. Other starters may also be held out or pulled early.