K K Paul in 2001 charged Cronje, Herschelle Gibbs, Nicky Boje, Pietr Strydom and Henry Williams with fixing One-day matches during South Africa's tour of India in March the same year.
Officials said on Wednesday that 56-year-old Paul, who holds a post-graduate degree in chemistry, would be promoted to commissioner of the 71,000-member New Delhi Police Department on Monday, a day after his predecessor R S Gupta retires.
The ace detective, who has also named a South African restaurateur and several punters as the conduits of Cronje, has vowed never to give up his efforts to bring the other four to New Delhi to face trial for match-fixing in India. Cronje died in an air crash in 2002.
"Our police could not bring Cronje because an extradition treaty with South Africa did not exist then, but the two sides in October signed the pact and given Paul's nature he will pursue the case after becoming commissioner," a senior official said.
Paul has made startling comments on non-co-operation from South African security agencies on Cronje's case, which later opened a can of worms with players like former Indian skipper Mohammad Azharuddin and batsman Ajay Sharma being banned for life on charges of match-fixing in other tours.
Australia's champion leg-spinner Shane Warne and now-retired batsman Mark Waugh, South Africa's Gibbs, Pakistan's Wasim Akram, Waqar Younis, Saeed Anwar and Inzamam-ul Haq are all leading players fined or penalised for match-fixing.