The new Chief Secretary, John Lee, is to act as the Chief Executive on Monday - on his fourth day on the job.
He'll be filling in while Carrie Lam leads a delegation to Beijing to attend celebrations to mark 100 years since the founding of the Chinese Communist Party.
Lee will be acting Hong Kong leader until Lam returns on Thursday.
The judiciary also announced that Chief Justice, Andrew Cheung, and High Court top judge Jeremy Poon are joining the celebrations in the capital, as well.
Other ministers making the trip up north include Financial Secretary Paul Chan, the Justice Secretary, Teresa Cheng, and the new Secretary for Security, Chris Tang.
The government said the Constitutional and Mainland Affairs Minister, Erick Tsang, the head of Lam's office, Eric Chan, and the heads of several disciplined services and agencies will also be part of the delegation.
Last Friday, Lam announced a cabinet reshuffle, with Lee replacing the outgoing Matthew Cheung, and the former police chief, Tang, taking over Lee's old role.
Last updated: 2021-06-27 HKT 19:10