Health Secretary Matt Hancock will host a Downing Street press conference later today, No 10 has announced.
It comes amid concerns about the Oxford/AstraZeneca vaccine 's effectiveness against the South African coronavirus variant.
Receive newsletters with the latest news, sport and what's on updates from the Liverpool ECHO by signing up here
Vaccines minister Nadhim Zahawi was forced to defend the vaccine after a new study in South Africa found it was not effective at preventing mild illness caused by the more infectious mutation.
South Africa has suspended the rollout of the British-designed vaccine to healthcare staff following the results, which have yet to be peer-reviewed.
The small study involved some 2,000 people in South Africa with an average age of 31.
The preliminary findings appeared to confirm theories that virus mutations seen in South Africa will allow for ongoing transmission of the virus in vaccinated populations.
On Sunday, lead researcher in the Oxford team Professor Sarah Gilbert said the current vaccines "have a reduction in efficacy against some of the variant viruses".
Find your nearest vaccination centre by entering your postcode below
However, she added: "What that is looking like is that we may not be reducing the total number of cases but there's still protection in that case against deaths, hospitalisations and severe disease."
It is likely Matt Hancock will speak tonight in an effort to restore public confidence about the vaccine.
Downing Street has not confirmed what time Mr Hancock will host the press conference, but it is likely to be around 5pm.
