The cricketer-turned-commentator also placed the intense on-field rivalry between India and Australia just a rung below that India-Pakistan duel.
He was speaking at a function here last evening organised by the Australian Trade Commission to elicit business around the 2015 Cricket World Cup which the country is co-hosting with Trans-Tasman neighbours New Zealand.
"I studied in English convent school so English manners were pretty good, but (I thought) enough of England. You wanted to get out to Australia perform in their zone, play hard, play fair and play to win and to do that you got to be hard yourself," he said.
"You go and ask the young team of the '90s who really learnt how to fight and compete, the Gangulys, the Dravids, the Tendulkars. They were that era of players. It happened because of Australia," said Shastri.
Former Australia pacer Shaun Tait, who played for Rajasthan Royals in the IPL, agreed with Shastri and said the current lot of Indian players were not afraid of anyone, which may have been the case earlier.