Yesterday, the tight end took part in his first drills with the team since tearing a knee ligament in a pre-season game against the Philadelphia Eagles last year.
The 25-year-old told the team's website: "It feels great. I have been at it a long time. I was really excited to get back out there today, finally put on the pads and be out there with the guys.
"I am confident. I am excited to get back out here. I know if I focus on getting out here and playing and doing what I need to do, everything will be all right. I feel great.
"I knew it would be a long road. I just kept my faith in God and just kept working hard. I knew at the end I would be all right."
Johnson could feature in the Steelers' pre-season game against the Kansas City Chiefs on Saturday.