The announcement of Canberra's extended COVID-19 lockdown until October 15 proved the final nail in the coffin for the capital's rugby union competitions, with all five senior leagues to be cancelled.

It marks the first time the 83-year-old John I Dent Cup has not been awarded since 1944.

Brumbies general manager of community rugby, and deputy chief executive officer, Craig Leseberg said every avenue was explored in attempting to finish the season.

However, given the extension and the uncertainty of COVID-19, the code believed it was the most responsible decision moving forward.

"This will be a disappointing outcome for the multitude of players, coaches, volunteers, and match officials who have invested an extraordinary amount of time and effort this year," he said.

"We extend our sincere gratitude to everyone for your dedication and commitment.

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"We encourage all within our rugby community to continue to abide by the current public health orders and strongly recommend that you get vaccinated, so that we have the best opportunity for a successful return of rugby in 2022.

"The important thing now is for us to stick together as a rugby community and we urge anyone who needs help at this difficult time to make use of mental health and wellbeing services."

Adding to the decision was the ongoing uncertainty around when and how community sport could return in both the ACT and NSW, given the unique geographical make up of several codes in Canberra, alongside the required transition period of training to competition for contact sport meant that a resumption became unattainable.

However, there was some hope for students from nine ACT schools on Wednesday, as they had the opportunity to virtually ask questions of NSW cricketers Mitchell Starc and Ollie Davies.

"It's been a challenging couple of years with the pandemic, particularly over recent months and while we can't get out into the community in person, it was fantastic to connect with schools online," Davies said.

"Both Mitch and I had a heap of fun talking to students about all things cricket and hopefully our stories will inspire many to register for their local cricket club this summer, where they are guaranteed to have a heap of fun in a safe and supportive environment."