The Raiders will be without starting right guard Gabe Jackson for approximately two months after he sustained a right knee injury Thursday during a joint practice with the Los Angeles Rams. Coach Jon Gruden said following practice the Raiders were “really concerned” and although their worst fears weren’t realized — Jackson is not out for the season and will not need surgery — the five-year veteran doesn’t figure to return until October. A source said Jackson would be out eight weeks with an MCL strain “give or take a few” depending on how fast he heals. If Jackson is out […]