Extra police will be sent to patrol Manuka Oval on Tuesday night to prevent cricket fans from Sydney's coronavirus hotspots sneaking into the venue.
Venues Canberra moved to block people from Sydney and the surrounding region attending the Big Bash clash after quarantine rules for travelers came into effect.
Fans from one of NSW's affected areas have had their tickets to tonight's clash between Sydney Thunder and Perth Scorchers cancelled.
Ticket sales for the clash were halted at 6pm on Monday. Cricket Australia will provide refunds to fans who have had their ticket cancelled.
But ACT authorities remain on high-alert, calling in police to help prevent banned spectators somehow entering the venue. Ticket holders who can prove they haven't come from one of the designated NSW local government areas will be allowed to enter.
Venues Canberra chief operating officer Matt Elkins said event staff including media, cleaners, catering and security would be required to complete a declaration form on arrival at Manuka Oval.
People arriving in ACT from Greater Sydney, Central Coast and Wollongong are required to go into 14 days of mandatory quarantine, under rules aimed at shielding Canberra from the northern beaches cluster.
As of Tuesday morning, 301 people will be required to isolate after returning to the ACT from NSW.
ACT Health has received more than 860 self-declaration forms, but many of those people won't need to quarantine as they are only transiting through Sydney en route to Canberra.
The match starts at 7.15pm.
