The Oakland Raiders were hit with terrible news during Thursday's joint practice with the Los Angeles Rams. Offensive lineman Gabe Jackson was carted off the field with an undisclosed injury, according to Josh Alper of Pro Football Talk.

Jackson was projected to start at right guard for Oakland this year, but that's in doubt now. It looks like it'll require Jackson to miss an extended period of time, but no one will know until an MRI is done.

The former Mississippi State Bulldog was expected to start at right guard, next to new addition Trent Brown.  If he can't suit up week one, it doesn't look good for the Raiders.

Behind Jackson on the depth chart is former undrafted player Denver Kirkland.  Kirkland has never gotten meaningful snaps, so throwing him into the fire right away is a recipe for disaster. Another option is former Arizona Cardinal, Jonathan Cooper. Cooper was drafted seventh overall in 2013 and has never lived up to that draft status. He would likely be an upgrade over Kirkland, but not by much.

Although it doesn't look good, it could quickly look worse for the Silver and Black. Hopefully, Jackson can return in time to face the gauntlet of interior defenders the schedule has. In 2019, the Raiders linemen will have to face Chris Jones, Geno Atkins, Linval Joseph, and Jurrell Casey, to name a few. Just reading these names is enough to make offensive coordinator Greg Olson lose sleep. If Jackson can't return, expect another tough year for the Raiders offensive line.