People in Wales told to stay home from Friday, with pubs and restaurants ordered to close.
A decision on local rules and financial support must be made "one way or another", a minister says.
Yasmin Qureshi says she started to feel unwell about two weeks ago and immediately self-isolated.
The move is part of a bid to stem the spread of coronavirus and will be reviewed on 2 November.
The singer and guitarist was narrowly beaten by Robbie Williams to Christmas number one.