Two days after a scary incident in which he was taken off the field on a stretcher, San Francisco 49ers defensive end Tarron Jackson has landed on injured reserve. The Niners announced Tuesday that they've placed Jackson on IR with what the team is calling a neck injury he suffered midway through Sunday's practice.

San Francisco placed defensive lineman Tarron Jackson on the Injured Reserve List, two days after he suffered a neck injury in a team practice. In a corresponding transaction, the team signed defensive lineman Jaylon Allen, most recently of the United Football League’s Memphis Showboats, to a one-year contract.

The 49ers have placed defensive end Tarron Jackson on injured reserve, the team announced on Tuesday. Jackson, 27, had to be taken off the field on a stretcher over the weekend after sustaining a neck injury. He was taken to Stanford Hospital, where he was conscious and had feeling in his extremities.