Veteran OT Tra Thomas will sign with the San Diego Chargers pending a physical he is taking Wednesday, a league source tell NFL Network's Jason La Canfora. Thomas likely would be insurance for Chargers left tackle Marcus McNeill, who along with wide receiver Vincent Jackson, has yet to sign his restricted free agent tender. Thomas, 35, spent last season in Jacksonville, where he played mostly as a backup but started three games. Source: NFL.com