First Minister Mark Drakeford said the tourism and hospitality sectors shouldn't face further specific restrictions once they reopen - but urged operators to look at existing rules and consider ventilation.
At the Committee of the Scrutiny of the First Minister, Aberconwy MS Janet Finch-Saunders asked Mr Drakeford if sites would need to bring in additional measures due to the extra transmissibility of the Kent variant of Covid-19.
She also urged Welsh Government to give sufficient notice of reopening so operators could prepare premises and staff and inform suppliers.
Leisure, hospitality and tourism has been closed in Wales since December 20.
Even when they were open there were rules in place to keep customers safe - from social distancing to track and trace and supplying hand sanitiser. At Alert Level 3, alcohol couldn't be consumed on site and there were 6pm closing times.
On any additional measures for hospitality sites, Mr Drakeford: "We have already strengthened regulations in relation to the workplace to take account of the new variants and the fact some of the safeguards that where there previously may not be strong enough to withstand the transmissibility of the Kent variant.
"The first thing I would probably advise people in the sector is to check what has already been changed and to see if that is relevant to them.
"It does put an extra emphasis on ventilation than we did earlier in the year because we know that good ventilation is a real defence against coronavirus.
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"I have not seen advice come to me that would suggest we would change the regulation specifically for the hospitality sector but I think they would be sensible to look to the changed regulations for workplaces which we took about three weeks ago."
On reopening he added: "Moving down the levels will happen slowly and with lots of notice and with plenty of time for us to run through some of those issues together with the sector."
He said shifting up alert levels sometimes had to be done at short notice as the advice from public health chiefs is to move rapidly.
But he said a more measured approach can be taken for reopening for the sectors.
He said: "My absolute hope is that we are entering the spring in a way that things will get better and if things get better then there will be more time to explore that with the sector and to make sure they get the notice that they need.
"I have heard from the sector and from you that three weeks is what hospitality would need for the reasons you have set out."
Plaid Cymru MS Bethan Sayed also asked about potential reopening prospects for the culture sector, which has largely remained shut since March.
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The First Minister said: "It is very difficult to provide any assurances to people and in every sector people are seeking those assurances, 'When will this be possible, when can that reopen?'.
"And the answer is that we are living in a period of such great uncertainty we simply don't know what's happening month upon month.
"We can't give people real assurance to say 'this will be possible by Easter' or whenever the date may be.
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"But in the plan(Alert Level) that we published on the 14th of December where we put the alert levels in place then those levels do demonstrate what can happen at each and every level.
"The hope was that that could help the various sectors to show them where they are in terms of those alert levels and when we do move from one level to another.
"If things continue to improve through the spring then I do want to be creative in our response to see whether there are new possibilities so we can provide pathways to people working in both culture and sport.
"Everything will depend on the context that we face at that time. There are some things in our hands but many other things that not one of us can predict."
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