St. Louis Rams running back Isaiah Pead was streaking down the field on a kickoff return when he spilled to the ground untouched.
The non-contact injury appeared to happen when he planted on his left foot in Saturday's preseason game against the Green Bay Packers. The running back was helped off the field by trainers and carted to the locker room.
It turns out the injury is an ACL and Pead is lost for the season. The third-year back was well behind Zac Stacy, rookie Tre Mason and Benny Cunningham in the backfield pecking order, but was expected to make the squad due to his play on special teams.