Speaking to 'ESPNCricinfo', Shastri lavished praise on Fletcher, who is under the scanner after a mixed tour of England during which the Indians were thrashed in the Test series before bouncing back to win the ODIs.
"He is tremendous. He would have done over a 100 Tests as coach, which is massive. He is technically very sound. He is a solid character. He is respected. He is a fatherly figure," Shastri said.
"Fletcher is the coach. He looks after the handling of various things including little, little stuff. My experience comes into play from the outside - of having been there, done that. The fact that I watch so much is a massive help. And my personality is such if I feel like saying something I don't hold back. I don't care who it is."
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"I got more than I would have expected. I say that only because of England's record at home, not many sides have thrashed them 3-0 in a four-ODI series. It is a big achievement: from what they were mentally after the Test series defeat, and then to respond in that fashion made me feel proud," he said.
"I had to make it (the dressing room) a place where the boys wanted to enjoy themselves. I was very clear when I said I am doing this job because I believe in them. And that was enough. As I got talking to them one on one, things started falling in place," he added.
"I was not afraid to speak to a guy individually. Ground, bus, bar, dressing room, while eating - we were talking cricket. Communication is important. The advantage I had was I had watched these boys a lot. I told them I have watched more cricket than I have played. I have learned more about cricket after I stopped playing," he said.