The safety had his lower right leg rolled up on during the first half of a mock game at Allegiant Stadium on Saturday and is feared to have suffered a major injury.

Lonnie Johnson Jr., who appeared locked into a training camp battle with Jamal Adams for a starting role with Las Vegas, collided with stud defensive end Maxx Crosby and broke his fibula on Saturday, according to ESPN. The injury will end Johnson’s season before it began.