Foster was emotionally distraught as he was assisted to the cart and into the locker room with an air cast on his left knee.
Not long after the first on-field workout of the Redskins' offseason program began Monday, Foster crumpled to the ground on the third play and immediately was tended to by defensive coordinator Greg Manusky and team president Bruce Allen. Allen was observing the workout from nearby.
The Redskins claimed Foster off of waivers when the San Francisco 49ers parted with the troubled linebacker last season. The 49ers let Foster go in the wake of a domestic violence accusation stemming from an alleged incident during a team road trip to Tampa, Fla.
Foster, 25, was a first-round pick out of Alabama in 2017. He has played in 16 of a possible 32 games in his career.
--Field Level Media