Returning from the India A tour of Australia in September, Hardik Pandya told his brother and Mumbai Indians team-mate Krunal something simple yet significant. "I actually have learned cricket on this tour," Krunal recounts his younger sibling as saying.

Pandya remembers it well. The India A tour helped bring his career back into stride after a disappointing IPL. "I remember that clearly," Pandya tells ESPNcricinfo on Wednesday, hours after his maiden call-up to the India Test squad. "Not just Krunal, I said the same to many players on that A tour."

So what exactly did Pandya learn that he did not know already? "The main change was learning how to be disciplined playing cricket," he says. "And playing Test cricket would be the most disciplined thing I will be doing."

Prior to the India A tour, Pandya says he played every tournament riding on his talent. However, during the 55-day long tour of Australia in the company of India A coach Rahul Dravid, Pandya began to understand what makes a long-form player.

Dravid narrated a lot of things during the Australia trip, but Pandya cannot forget one point the former India captain made. "We were talking about what is a natural game," Pandya says. "He [Dravid] said that there is no such thing called a natural game. It is just that in cricket you play according to the situation, and you win the games."

Soon Pandya found himself in the middle of one such tight situation. It came during the first innings of the second unofficial Test against Australia A at the Allan Border field in Brisbane. Put in to bat, India A were struggling at 46 for 6. Pandya was the last specialist batsman. He ended being the last man out, in the first over of the second morning, having made 79. The match ended in a draw

"Lately I have been more disciplined," Pandya says. "I wanted to perform in every game, but had not done much till then. In that match I told myself I can be the standout player, this is the last game of the tour, and I should do something really amazing. They came really hard, but I also responded hard and it worked."

Pandya says the biggest takeaway from the India A tour is that he now understands the nuances of the game a little bit better. Krunal agrees. "In his bowling he is now more clear with his thought process. Now his mind is quite clear what to do, when to do. If you think two things at the same time then you cannot execute your plan. He told me now he is very clear with his though process about what he has to do next in a situation."

Hardik Pandya gets his ODI cap from former India captain Kapil Dev BCCI

On October 11, Pandya celebrated his 23rd birthday. Five days later he made his ODI debut in Dharamsala, in the first ODI of the series against New Zealand. Kapil Dev, India's greatest allrounder, presented Pandya his ODI cap. During the handover Kapil shared a tiny nugget of information: he had made his Test debut in 1978 on the same day, October 16. "The feeling, that moment, I will cherish that all my life. I will never forget that I got my cap from Kapil Dev."

Pandya says the Test call-up is the biggest moment of his cricketing life. "Honestly, being called for the Tests is more pleasing and happier moment," Pandya says. "I have been in the scheme of things as far as ODIs are concerned for a while, but to get a call for Test cricket is the main thing. It tests your temperament, fitness, work ethics, mental strength."

Pandya's cricketing ride so far has been akin to being on a rollercoaster. He started on a high in his maiden international series, against Australia in the T20Is earlier this year. He showed courage and presence of mind during a last-over, one-run victory against Bangladesh in the World Twenty20 before sliding swiftly during the IPL where Mumbai Indians preferred Krunal over him.

Pandya was then ignored for the limited-over series in Zimbabwe before being recalled for the fortunes-turning India A tour of Australia. He says he let external forces affect him in that low period. "It was very difficult during the IPL," he says. "I was focusing on what people were saying about me. They were saying he is not focusing on his cricket. Until then I never used to worry about what outsiders said. But after making a name I was not used to people talking so much about me. Eventually it harmed me slightly. I was not focusing on things I should have focused on. Then I learned that if you are successful, people will say things and if you get affected it will not help. So I learned I had to be slightly low-profile and mellowed down."

The Pandya that came back was better equipped to handle tight situations. "I am more consistent as a bowler than what I was previously," he says. "I was slightly wayward in Twenty20. But everything was new for me in that phase. Now I know I should and should not do."

Pandya backs the talk with an example, his first over in ODI cricket. "After four balls I had gone for 12 runs," he said with a chuckle. "For a second I thought of my T20I debut over where I had gone for 19 runs. But I backed myself. The fours that went were mostly outside edges. Then I got a wicket off the last ball."

That wicket was of Martin Guptill, who had hit those three fours with a tentative bat, before eventually edging to the second slip. Pandya finished with three wickets and earned the Man-of-the-Match award on debut.

Not just bowling with the new ball, another evident change in his bowling is the speed. Pandya clocked speeds in the 140s consistently against New Zealand. "MS bhai [Dhoni] has been a big support, giving me the new ball," he says. "It has helped in my growth as a bowler." Dhoni told him that with his deceptive pace and with his ability to swing the ball, Pandya could easily grow into one of the three main fast bowlers for India in ODIs.

Hardik Pandya bowled the last over again Getty Images

The pace, Pandya points out, has not come overnight. "As a fast bowler you don't go up in your pace in a month," he said. "I have maintained a proper diet, proper eating habits, proper sleeping habits, proper fitness. It is about being disciplined in line and length. Paras Mhambrey [the bowling coach] helped me with that during the India A tour."

The changes are not lost upon keen observers. MSK Prasad, chairman of India's selection committee, noted that Pandya had mellowed recently. Flamboyance, animated celebrations on the field accentuated by an extroverted personality, Prasad said, was what people associated Pandya with. That maverick element is still there, but he is much more composed in his attitude and more focused on the job at hand.

"You can make out by his celebrations in the last three to four months," Krunal says. "It is just the beginning. He is aiming to play consistently for India and do well. It is just a small step, but a very important one."

Pandya's selection might be seen as a left-field choice considering his lack of first-class cricket since he started playing domestic cricket for Baroda in 2013. Pandya has played only 16 first-class matches, but reckons that cannot be seen as a limitation. "I am quite confident that I will be able to play good Test cricket," Pandya says. "I know what capability I have. Eventually in life you learn things by doing. So I am not thinking whether I will play [against England] or not. I know I will learn something from this series."