A coronavirus crackdown threatens to derail top-flight competitions and pre-season training plans after ACT Health enforced a strict 14-day quarantine period for anyone travelling to the capital from Sydney. In the latest COVID-19 development, the Canberra Raiders, ACT Brumbies, Canberra Cavalry and Canberra United are set to be caught up in quarantine changes. ACT Health is enforcing new restrictions in reaction to the growing cluster in Sydney, urging people to avoid travel to greater Sydney and enforcing quarantine for anyone arriving from Greater Sydney, Central Coast, Illawarra-Shoalhaven and Nepean Blue Mountains from Monday. Sydney-based Raiders and Brumbies players were set to return home during their end-of-year break, while others would likely have travelled north to enjoy a rest from NRL and Super Rugby preparations. But any players going to Sydney and its surrounding regions would need to spend two weeks in quarantine before restarting training.