Johnson reverted to Las Vegas' practice squad Monday, Paul Gutierrez of ESPN.com reports.
Johnson played just one offensive snap during Sunday's loss to the Chiefs. The second-year wideout has made six appearances this season -- spilt between Jacksonville and Las Vegas -- and has caught just two of his five targets for 16 yards. As a rookie with the Chargers last year, he caught 20 passes for 398 yards and three touchdowns.