Tougher Covid restrictions could return in Wales in three weeks if infections continue to rise, Mark Drakeford has warned.
The Welsh First Minister said self-isolation rules were being tightened to tackle high Covid rates - and further measures could be coming down the line.
Fully vaccinated adults and children over five-years-old will be asked to self isolate until they have received a negative PCR test if someone in their household has symptoms or tests positive.
People who haven't had both jabs must self isolate for 10 days following contact with an infected person.
Covid passes will be required in theatres, cinemas and concert halls from November 15 - and hospitality venues may also be ordered to ask customers to prove their Covid status.
And Mr Drakeford warned that he will have no choice but to go further if the situation doesn't improve.
Wales has been at the lowest level of restrictions - alert level 0 - since August but people are still required to wear masks in some indoor settings, unlike in England.
The alert level is due to be reviewed in three weeks time.
Mr Drakeford told a press conference on Friday: "I must be clear if rates continue to rise rather than fall, the cabinet will have to consider raising the alert level and reintroducing some further restrictions at the next review.
"None of us want to see that happen. None of us want to see a return to restrictions in the economy or in our own lives.
"That is why over the coming three weeks we will strengthen six measures, from the requirement to wear face coverings to changing the guidance on self isolation."
Wales has the highest prevalence of Covid cases in the UK, with one in 40 people infected in the week up to October 22- the highest level since estimates began in July 2020.
This compares to one in 50 in England, and one in 75 in both Scotland and Northern Ireland, according to the Office for National Statistics.
Mr Drakeford said there were high infection rates among young people and the virus was spreading among households.
He also pointed to suspected testing blunders at a lab in England, where people were believed to have been given negative PCR tests incorrectly.
Mr Drakeford said he regretted the UK Government's decision to remove all countries from the travel red list - but said it would be impractical for Wales to go another way.
Earlier, the FM to the BBC that the hospitality industry needed to "use the next three weeks to prepare for the possibility that Covid passes may have to be introduced in that setting".
The next alert level requires people to wear masks in all indoor settings and bans indoor meet-ups of more than five people.
Outdoor gatherings are restricted to 30 people and travel to high prevalence areas without a reasonable excuse is banned.
Nightclubs and adult entertainment venues are also forced to close.
It comes as Boris Johnson has faced pressure from scientific experts to implement "plan B" measures in England, which include masks, working from home and vaccine passports.
