Chargers WR Quentin Johnston diagnosed with concussion

Quentin Johnston, the Chargers’ first-round wide receiver, was carted off the field after a hard, helmet-to-turf collision on the third play of Saturday’s preseason game against the Rams at SoFi Stadium. He was diagnosed with a concussion and taken to a local hospital for precautionary testing, with Chargers head coach Jim Harbaugh saying the injury was “not a good thing” in the moment but noting that Johnston was conscious, moving his extremities and talking with medical staff on the field.

The sequence occurred on a deep route during the Chargers’ opening series. Johnston appeared to secure the pass from Justin Herbert, but Rams safety Tanner Ingle delivered the hit that sent him crashing to the turf. There was no flag on the play, and medical personnel from both teams quickly attended to him as teammates and opponents knelt nearby. Johnston eventually stood and walked to a cart that transported him to the Chargers’ locker room for further evaluation.

In the immediate aftermath, rookie KeAndre Lambert-Smith entered the game to continue the Chargers’ first offensive drive, joining a starting unit that had been deployed by coach Jim Harbaugh early in the exhibition season. The...