The UK is on track to meet its target of offering a vaccine to every adult by September, and beating that would be a “bonus”, the foreign secretary said.
Dominic Raab reiterated that the plan was to deliver 15 million jabs by mid-February and 17 million more by spring.
Asked about reports that every adult could be vaccinated by the end of June, he told the BBC: “If it can be done more swiftly, that’s a bonus.”
It comes as 24-hour vaccine centres are due to be piloted in the next ten days.
Mr Raab told the Andrew Marr Show that he was not aware of any delays to supplies from manufacturers Pfizer and AstraZeneca and said he was “confident we have the flexibility” to deliver enough doses.
“It is an enormous challenge. We are meeting it,” he said. “But we take nothing for granted.”
Saturday’s figures showed a further 324,233 people received their first of two vaccine doses across the UK, taking the total above 3.5 million.