“Do I think it’s likely to happen? No, I don’t.
“I think we are much more likely to be on a steady course now out of this pandemic, at least in this country.”
On Monday, Boris Johnson suggested some “opening up” of foreign travel could be allowed for people in England on May 17 but added that “we have to be very, very tough.”
Foreign holidays are currently banned but the Government is expected to categorise which countries are classed as green, amber or red in their latest traffic light system of rules.
Step three and four of Mr Johnson’s roadmap out of lockdown has yet to be confirmed, but the Prime Minister said the results of the vaccine were “really starting to show up in the epidemiology.”
Step three of lockdown easing measures will not be implemented before May 17.
Ministers have previously suggested that further lockdown easing will only go ahead if the data supports it.
Professor Reicher added: “If we believe there is no risk at all, if we start mixing without restraint, then we’re going to be in real trouble.
“Remember, two months ago in India they were declaring the pandemic was all over, now they’re having 400,000 cases a day.”
Currently, more than 34 million first doses of the vaccine have been administered across the UK and over 15 million have been fully vaccinated.