"We'll put him in there and get him going," Shurmur said.
"I mistakenly failed to clear it with Eagles trainers and check the NFL list of banned substances. I am extremely sorry for this mistake and I will learn from it and be smarter in the future."
Johnson was the top pick of the Eagles in 2013 and started all 16 games, rating as a great run blocker but a poor pass blocker according to ProFootballFocus.com.
The Eagles' first four games are against the Jaguars, Colts, Redskins and 49ers.
"It went good. I think I had some rookie bumps in the first half of the year, but toward the latter part of the year I think I played really well," he said. "I think my body is a whole lot more rested than it was last year. I feel a lot stronger than I was last year, I weigh more than last year – it’s the most I’ve ever weighed – and I just feel that from a mental aspect I know what to expect. Nothing is going to catch me off guard."
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