India, Dec. 22 -- Baltimore Ravens quarterback Lamar Jackson did not return after halftime in Sunday night's 24-28 loss to the New England Patriots, exiting with a back injury suffered late in the second quarter.

Jackson was replaced by Tyler Huntley, who stepped in to play with Baltimore trailing. The injury now raises questions about Jackson's availability heading into the coming weeks and about who stands behind Jackson if he remains unavailable.

The injury occurred on a short run near the end of the first half. Jackson appeared to take a knee to the back while going to the ground. He stayed on the sideline briefly, looking uncomfortable, before heading to the locker room.

Head coach John Harbaugh said afterward that Jackson was dea...