Johnson (concussion) isn't practicing Wednesday, Courtney Cronin of ESPN.com reports.
Johnson hasn't practiced since suffering a concussion in a Thursday night win over Washington in Week 5. He missed the Week 6 loss to Minnesota in which D'Onta Foreman and Darrynton Evans handled the backfield work while Johnson, Khalil Herbert (ankle) and Travis Homer (hamstring) all sat out. Another missed practice suggests Johnson is in danger of missing a second game this Sunday against Las Vegas.