Bakti spoke of "hundreds of arrests" after the government and the Football Association of Malaysia clamped down on match-fixing. Even last year, a coach was jailed for three years, he said. A 2010 report on the internet said illegal betting on football is worth up to 20 billion ringgits.
But close scrutiny of the top tier may have left the under-21s more vulnerable, said Bakti.
"Retired players are part of most such set-ups and tapping under-21 players is easier and can also act as investments for the future," said Bakti without elaborating.