Chan and Tsang last went to work on June 20 and June 22 respectively. They wore masks and followed relevant disease prevention measures at work, including rapid antigen tests conducted daily with negative results obtained. They have no recent travel history.

They are undergoing isolation in accordance with the guidelines of the Centre for Health Protection (CHP) of the Department of Health.

Chan and Tsang may not be able to attend the inaugural ceremony of the sixth term HKSAR government in person on July 1. “The Government will closely monitor the development and make appropriate arrangements,” a government spokesman said Thursday night.

Chan, who is the current director of the Chief Executive's Office, has been undergoing quarantine since Tuesday as his wife has earlier tested positive.

Louise Ho Pui-shan, the wife of Tsang and also the Commissioner of Customs and Excise, has tested negative for a Covid-19 nucleic acid test. She is identified as close contact and is undergoing quarantine.

The Constitutional and Mainland Affairs Bureau and the Chief Executive's Office will conduct thorough cleaning and disinfection at the offices concerned, and will arrange for relevant staff to undergo Covid tests in accordance with the advice from the CHP.

In addition, the Permanent Secretary for Development (Works), Ricky Lau Chun-kit, had tested positive for Covid through nucleic acid test.

He had been undergoing quarantine and working from home since June 19 following the guidelines of the CHP as his wife has earlier tested positive. He last went to work on June 17 and has no recent travel history.