The Indian team settled for a silver medal in its best- ever Champions Trophy performance after it went down fighting to world champions Australia 1-3 in a controversy-marred summit clash penalty shootout in London last Friday.
"After our Champions Trophy performance, especially the way we played the final, we have a great chance in Rio and we are very optimistic about a podium finish there. We will give our best and this silver medal will work like a tonic for us," Sunil told PTI Bhasha in an interview from Spain.
"Earlier, we used to get scared about all top teams but now we all know that we can beat any team in the world. So, mentally, we have changed a lot, toughened up, and all the credit goes to chief coach Roelant (Oltmans), who always infuse the much needed self belief in us," he said.
Asked if there was any specific preparation to get rid of the mental block, he said that it's all about self motivation.
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Seventh-ranked India defeated bigger teams like Britain and drew the opening match against Olympic champions Germany in the prestigious tournament recently.
Despite the morale-boosting result, Sunil identified certain areas where the team needs to work harder.
"We need to improve more on striking zone. We have to work on perfect finish after entering D circle. With improvement in our attack we can repeat this performance in upcoming tournaments," said the ace forward.
He is disappointed with the standard of umpiring in the final but is happy with India's overall performance in the tournament.
"We had no time to celebrate as we had to move to Spain immediately," he said when asked about how the team celebrated this historic win.