The Northern Ireland (Ministerial Appointment Functions) Regulations 2019

Under section 5 of the Northern Ireland (Executive Formation and Exercise of Functions) Act 2018, during the current period while there is no Executive in Northern Ireland, appointment functions conferred on Northern Ireland Ministers may be exercised by a Minister of the Crown in respect of the offices specified in that section. Section 5 also permits further entries to be added to the list of specified offices by regulations.

Link: The Northern Ireland (Ministerial Appointment Functions) Regulations 2019
Source: Legislation .gov.uk