Thornton (hamstring) has been ruled out ahead of Sunday's game against the Patriots, Paul Gutierrez of Raiders.com reports.
Thornton was a full participant in all three Week 5 prep practices but will not be activated from IR for Sunday's contest. The wide receiver was designated to return to practice Wednesday and the Raiders likely deemed the 23-year-old to not be adjusted to NFL physicality enough to return to the field the same week.