Los Angeles Chargers receiver Quentin Johnston left the SoFi Stadium field on a cart after taking a big hit on the third play of a preseason game Saturday.

Jim Harbaugh talks about the concussion receiver Quentin Johnston sustained in the Chargers' preseason loss to the Rams.

Coach Jim Harbaugh said Johnston sustained a concussion when he absorbed a hard hit from Rams safety Tanner Ingle on a deep pass from quarterback Justin Herbert and then struck his head on the turf.