Prime Minister Boris Johnson will hold a Downing Street press conference today.
The PM is due to address the nation at 5pm alongside NHS England chief executive Sir Simon Stevens.
Health Secretary Matt Hancock was initially billed to join Mr Johnson - before Downing Street amended the line-up.
It is understood that there will be a further announcement about the current vaccine roll out.
Nearly 20,000 second doses of Covid-19 vaccines were administered between December 29 and January 3, NHS England has said.
Some 19,981 second Pfizer jabs were given as of Sunday, which was before the rollout of the Oxford/AstraZeneca vaccine. All vaccinations given before December 29 were of first doses.
Overall, 308,541 people received a jab in the week ending Sunday January 3, taking the total number vaccinated in England since the rollout began to 1,112,866.
Of those, 661,224 (60 per cent) were given to people aged 80 or over, the health service said.
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