Chargers sign McBriar to replace injured Scifres
Scifres broke his left collarbone Sunday night in a 23-14 loss to New England when Brandon Bolden crashed into him after blocking a punt in the second quarter.
The 35-year-old McBriar previously spent time with Denver, Seattle, Dallas, Philadelphia and Pittsburgh during his 12-year career.
The Chargers also re-signed center Jeff Baca to the practice squad.
The moves were announced on Tuesday.