The match in question was played in the Swedish capital on Tuesday.
The ACSU "noticed unusual betting patterns on the game" and is likely to get in touch with leading betting firms, including Betfair, in an attempt to get a clearer picture, claimed a report in 'ESPNcricinfo'.
The development comes right after Hong Kong's five-wicket victory in the first qualifying playoff, which booked them a berth at the 2016 World Twenty20 in India. The tournament will be held from March 11 to April 3 next year.
Despite the defeat, Afghanistan still have a chance to qualify for the mega-event. They play Papua New Guinea today in the third qualifying play-off.
