NAPA, Calif. -- Oakland Raiders right guard Gabe Jackson was carted off the practice field late in Thursday's joint practice with the Los Angeles Rams with an injury to his left leg.
Jackson was rolled up on from behind in a live team drill, a few minutes after being involved in a scrap with Rams defensive tackle Aaron Donald.
"We're concerned, obviously," Raiders coach Jon Gruden said. "Really concerned about him. But we'll get more information here and we can be specific for you. I don't want to speculate.