"He has impressed me from Day 1. I remember facing him in the (Mumbai) nets and he hit me on the helmet with a short ball and I thought he was quick. He keeps things simple and doesn't try to overcomplicate things," Johnson told The Times of India. 

Bumrah, who made his Test debut earlier this year in South Africa, was brought into the Indian playing XI in the third Test of the ongoing five-match series in England after recovering from a thumb injury. The 23-year-old has picked up 10 wickets since then, including a match-winning five-wicket haul at Trent Bridge. 

In his five-match-old Test career, the Indian pacer already has 25 wickets to his name, with an average of under 23 and two five-wicket hauls.  

"There was a point when a batsman had started to get on top of him (in the Indian Premier League) and we had a chat regarding this. I told him that he needed to think ahead of the game. He is in the right environment at the moment and getting better with each match," said Johnson. "Bumrah's pace, coupled with his accuracy, is impressive."