HENDERSON, Nev. -- Las Vegas Raiders running back Ashton Jeanty, who had to be helped off the practice field Sunday, is believed to have sprained his ankle, sources told ESPN's Adam Schefter and NFL Network's Ian Rapoport.
The Raiders still are unsure how long Jeanty will be out, but it is not considered a long-term injury.
The Raiders declined comment.
During the team practice period Sunday, Jeanty ran a route and dove for the football, which was thrown low by veteran quarterback Kirk Cousins. Jeanty landed awkwardly on the turf grass inside the practice facility and stayed on the ground before being helped off the field by athletic trainers.
As he was being helped off, Jeanty couldn't put pressure on his right leg. His teammates took a knee and said a prayer after Jeanty exited the field.
Rookie running back Mike Washington Jr. took the first-team reps for the remainder of practice. Washington, who has had a strong training camp, was alternating starting reps with Jeanty before the injury.