Watson, 26, was a second-round pick in 2013 and started 12 games over the past two seasons. He was injured during the first quarter of Sunday night’s preseason game against the Arizona Cardinals.
Austin Howard, who started all 16 games for the Raiders at right guard last season, is listed as Watson’s backup. Veteran Khalif Barnes is listed as the second-string option at left tackle.
- Dan Gartland