British Prime Minister Boris Johnson is expected to unveil his anti-coronavirus plan for winter on Monday as local media reported that England will go under a tougher three-tiered system of local COVID-19 restrictions at the end of the current national lockdown.
A statement from the Cabinet Office said: "Welcoming the good progress made by all administrations over the past few days to design a single set of arrangements that can apply across the United Kingdom, ministers reiterated the importance of allowing families and friends to meet in a careful and limited way, while recognising that this will not be a normal festive period and the risks of transmission remain very real".
The British prime minister can not expect an easy approval of tighter measures as 70 conservative MPs have said they would not back a new set of rules until they see cost-benefit analysis.
It is not yet clear exactly how restrictions could change.
Mr Sunak said the localised tiered system is a "far better way" to tackle Covid-19 as he confirmed the Prime Minister's plans, which were expected to be approved by the Cabinet on Sunday.
The prime minister will acknowledge that the measures are hard, while making clear they are not to last longer than is absolutely necessary, and that the need to support the economy is being taken into account.
According to the Daily Telegraph, several families could be allowed to join in one "bubble" and mix between 22 and 28 December.
Asked if an announcement could be made this week, he said: "We have a cabinet coming up this week".
British Prime Minister Boris Johnson has announced plans for strict regional measures to combat COVID-19 after England's lockdown ends December 2, sparking a rebellion by members of his own party who say the move may do more harm than good.
A No 10 spokeswoman said: "Everyone's efforts during the current national restrictions have helped bring the virus back under control, slowed its spread and eased pressures on the NHS".
Recent developments on vaccines and mass testing provide "real confidence" that restrictions to control the virus can be gradually reduced, the prime minister's office said. "That would put in jeopardy the progress the country has made, and once again risk intolerable pressure on the NHS", the spokesperson said.
The PM will be wary of a rebellion from backbench Tory MPs opposed to new restrictions.
Subsequently, the Covid Recovery Group (CRG) led by former chief whip Mark Harper and ex-Brexit minister Steve Baker has formed to resist new measures.
Johnson's office also confirmed plans to begin a nationwide COVID-19 vaccination program next month, assuming regulators approve a vaccine against the virus.
But the opposition party has been urging the government to lay out its plan for what will happen when the national restrictions end.
She called for clarity about what economic support package would accompany different types of restrictions.
Ahead of the almost month-long stay-at-home lockdown, England had been placed in a three-tier system of graded social distancing rules based on the infection rates in particular regions.
Johnson's government has responsibility for health policy in England but devolved governments in Scotland, Wales and Northern Ireland coordinate their own responses to the pandemic.
Britain has suffered more than any other country in Europe from the coronavirus, with more than 54,000 deaths from 1.4 million cases.