Cricket's anti-corruption officials are keeping a vigilant eye on player apparel, coming at a time when six illegal Indian bookmakers have been arrested in the past week for taking bets on the Big Bash League.

Mumbai police arrested four men on Monday and two last week, the latter for accepting bets during the BBL clash between the Melbourne Renegades and Sydney Thunder. The Thunder won by six wickets with two balls remaining.

Senior Inspector Sunil Mane told the Mumbai Mirror that the two men arrested - Yukin Mukesh Shah and Vinod Yada - were suspected to be linked to a global betting syndicate, which was being investigated. The police reportedly recovered two laptops, a notebook, a paper containing several encrypted words, a delinking router, six SIM cards and several mobile phones.

Cricket Australia said on Tuesday it was aware of the arrests.

"Cricket Australia is aware of the situation and will continue to be vigilant in enforcing our anti-corruption measures," a CA spokesman said.