Johnson missed practice Monday due to a hamstring issue, Matt McMullen of the Chiefs' official site reports.
Johnson logged 28 defensive snaps along with seven special-teams snaps in Saturday's preseason loss to Detroit without recording any stats. He's likely to make the 53-man roster as a backup corner and special-teams player if he's able to get healthy. It's not yet clear how severe the hamstring issue is or whether Johnson will be able to play in Kansas City's final exhibition contest Thursday versus Chicago.