Ravens cornerback Asa Jackson left practice Sunday with the help of a trainer after injuring his right leg on a pass defense during full-team drills against the San Francisco 49ers at the Under Armour Performance Center.
After practice, Ravens coach John Harbaugh said Jackson had a "minor ankle thing" and will be out for "some number of days." Harbaugh said "it's not a major deal."
Jackson, who is seeing significant time at cornerback in the absence of injured veteran Lardarius Webb, told trainers after his injury that he felt something in his right Achilles tendon, though he said he did not feel a pop.
Jackson was in pass coverage and made a good play to break up a pass by San Francisco on the sideline. But when he planted his right foot out of bounds, his heel appeared to stick in the ground as the rest of his body went forward.
His absence caused a shakeup in the Ravens' secondary depth chart.
On the next first-team series after Jackson's injury, Chykie Brown and Jimmy Smith played cornerback while the team played three safeties -- Darian Stewart, Matt Elam, and Terrence Brooks -- instead of a third cornerback.