After topping their group, La Rojita beat Venezuela and Colombia 1-0 in the final six-team round before losing their unbeaten record in a 0-2 defeat to Paraguay.
A 1-0 win over Ecuador sealed a place for India but they suffered an ignominious 0-5 drubbing against Brazil for the continental crown in March this year.
"It was a tough match against Brazil but it's past now. Now we have prepared well to win against Brazil this time," Diaz told reporters today.
"It feels proud to have qualified for the U-17 World Cup. We look up to the senior team for inspiration," the O'Higgins forward added, referring to Chile's maiden Copa America triumph in 2015.
He further said Alexis Snchez, the star Arsenal forward, is a hero to them.
"Sanchez is not just an inspiration for me but the whole Chilean team. We all are really motivated by him."
The hot and humid condition of Kolkata is challenging for the Chileans who took special training in sauna-like atmosphere before heading to India.
His teammate Nicolas Aravena picked England and Mexico as the two tough opponents in their group which also features Iraq.
"England and Mexico will be difficult," said Aravena, who plays for Chilean giants Colo Colo.
Having gone through a rigorous selection process, Aravena said he will go all out during the premier tournament.
"I started playing when I was 12 and I loved the game and thought that I could be good at it. The selection process was really difficult but we are going to give our best.
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