Shastri was appointed Team Director after India lost the fifth and final Test against England in under three days to go down 1-3 in the series.
"My role is to oversee everything. All of them report to me. This is for the ODI series in England," Shastri told 'ESPNCricinfo'.
Asked if his position would affect Fletcher's stature, Shastri said, "Absolutely not. He stays as the head coach. And these two (Sanjay Bangar and B Arun) will be his assistants."
"It was an important time in Indian cricket. When asked I thought about it and then said, 'fine'. The state of Indian cricket is such that I know I can contribute. I have never been scared about how tough the job is or how easy the job is. The important thing is the contribution.
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"If I am here today, and at times some forget, it is because of the BCCI. The platform they gave me when I was a junior cricketer to play for my state and then the country," he said.
Asked what he felt were the reasons for India's failure in the Test series, Shastri said it was inexperience.
"If you calculate the number of Test matches played by the XI as opposed to some of the tours where we fared worse, here we at least won a Test match."
"On this tour I saw India's greatest ever overseas win I have seen. I know it because I have never seen a track like that and with this kind of inexperienced side for them to pull it off. Then I also saw some spineless cricket over the last three Tests matches.