After working with the 32-year-old during the recent Ashes whitewash, McDermott is convinced there is no better pace bowler on the planet despite the fact that he is only ninth in the world Test rankings.
Johnson was the leading wicket-taker against England with 37 dismissals at an average of 13.97 and McDermott is backing the left-arm quick can maintain his form in the upcoming series against South Africa.
“I think he probably is the best fast bowler in the world at the moment,” McDermott said ahead of the First Test with South Africa at Centurion. “He knows his game very well, and his accuracy is brilliant at the minute.
“He really understands where his wrist position is, (and) with his alignment through the crease.
“He really believes (in) himself so he’s the full package.”
Johnson has only taken nine wickets in five Tests in previous tours of South Africa, but McDermott is confident he can make an impact against the Proteas this time around.
“He’s got real wow factor to his bowling from a pace point of view now and he bowled beautifully during the Australian summer (against England),” the former Australia seamer added.
“That’s always been the plan with Mitchell. We wanted to use him as our shock bowler. When you’ve got someone like that you don’t want him to bowl seven or eight over spells.
“But he’s fit enough, if he’s on a roll, to bowl seven of eight over spells, so we’ve got the best of both worlds if it is required.”