Johnson, battling a left hamstring injury, had extensive work on the practice field Monday during a morning workout. After the practice, Johnson said he was anxious to test the leg in live action against an opposing team.
"I'll be out there on Saturday just to see how everything feels as far as game speed," Johnson said. "It actually is not healed yet. It's a work in progress."
Johnson is Buffalo's only established wide receiver.
He is coming off three consecutive 1,000-yard seasons and led the team last year with 1,046 receiving yards. He suffered the injury Aug. 2 when he pulled up on a route during a team drill.