Johnson has been struggling with shoulder and groin problems over the last 12 months.
“I’ve done everything I can to make sure I haven’t lost any speed,” Johnson told the Daily Mirror.
“I’ve worked on my glutes, my hamstrings and my core strength – everything that gives me pace. Of course, we’ll see when I get out there, but I’m confident I can be as fast as I’ve ever been.
“If it’s the end of September, October, or whenever, that’s when it is, but I can see the light now.”
