Brisbane Heat duo Chris Lynn and Dan Lawrence investigated for BBL bubble breach in Canberra

But the key pair will be free to play against the Sydney Thunder at Manuka Oval tonight, however they will be required to maintain physical distance from teammates and opposition players in the dressing room and on the field.

Cricket Australia confirmed Lynn and Lawrence came into contact with members of the public in Canberra on Saturday night. Both players have returned negative COVID-19 tests since Saturday.

Players are allowed to go out for dinner or a drink but must be seated in the outdoor area of a premises and remain in their own groups to comply with the game's biosecurity measures.

"It is important we maintain the integrity of the bio-secure hub to ensure the safety of the public, players, staff and officials and minimise issues associated with travel between state borders during the tournament," CA's head of security and integrity Sean Carroll said.

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"While we are fortunate to live in a country with a low rate of infection compared with many other parts of the world, we are still in the midst of a global pandemic and, as we've seen on a number of occasions in Australia, COVID-19 breakouts and border closures remain a genuine risk.

"We are always monitoring the public health situation and attempting to strike the appropriate bio-security balance between keeping everyone safe on both sides of the hub and providing as much freedom as possible for those within it.

"We appreciate that this has been a challenging year for everyone, but we must insist on our bio-security measures being respected and followed so as not to jeopardise public health and safety or the viability of the tournament."

CA chief medical officer John Orchard said the physical distancing required of Lynn and Lawrence in tonight's match had been achieved during practice matches and grade fixtures containing players in and out of bubble protocols.

"We're confident this will be successfully achieved again tonight at Manuka Oval," Orchard said.

"They must maintain a physical distance on and particularly off the field (indoors) with teammates, opposing players, staff and match officials. We have protocols in place for all matches for interaction between those inside and outside the hub.

"Factors including the outdoor nature of the contest, the generally socially-distanced nature of cricket on-field and the fact Canberra is considered a low-risk city support the conclusion that both can play tonight without posing a meaningful risk."