Chappell even went on to question their inclusion in the Indian Under-19 side, saying they should not be playing at the junior level just for the sake of winning the trophy.
Harmeet and Unmukt played a stellar role in India's U-19 World Cup triumph in Australia today.
"He (Harmeet) bowls like Bishen Bedi, with that same natural flight and guile that would right now place him as the best spin bowler in any Test side bar England," Chappell wrote in his column for 'Cricinfo'.
"Harmeet has the skills to be a successful spinner, and only needs to develop the necessary temperament to handle the tough environment of international cricket and have a sympathetic captain," he said.
Chappell argued that junior level cricket was surely a gateway to the senior team but players such as Harmeet and Unmukt should not stay there for long.
"....It's (U-19) not the right thoroughfare for exceptional talents like Harmeet and one or two other players on show in Townsville. The very best players need to be constantly challenged from a young age, and that means regularly being upgraded when they have success at a lower level.
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"That's why the big money needs to be spent on finding the right selectors rather than being lavished on a small-town population of coaches who often make decisions to justify their existence rather than in the best interests of the players.
"A cricketer like Harmeet will stagnate if he's left for too long at a lower level, because that leads to sloppy habits. Harmeet is ready to be considered for national selection. MORE