Transport Secretary Grant Shapps said the NHS app is being worked on to become a health certificate for international travel.
The app is currently developed to allow users to access a range of health services via a smartphone.
He told Sky News: “In terms of vaccine certification, I can confirm we are working on an NHS application, actually it will be the NHS app that is used for people when they book appointments with the NHS and so on, to be able to show you’ve had a vaccine or you’ve had testing.
“I’m working internationally with partners across the world to make sure that system can be internationally recognised, as that’s the way forward.
“Actually, I’m chairing a meeting of the G7 secretaries of state for transport, my equivalents from America and Canada and all the G7 countries, next week on exactly this subject.”
Details of the system will be released at the beginning of next month.
Overseas leisure travel could resume for people in England on May 17 under Boris Johnson’s road map for easing restrictions.
Mr Shapps said: “I have to say that so far the data does continue to look good from a UK perspective, notwithstanding those concerns about where people might be travelling to and making sure we’re protected from the disease being re-imported.”
He added he will set out which countries fall into the “green”, “amber” and “red” categories under the new risk-based traffic light system “towards the beginning of May”.
That will determine what testing and quarantine requirements travellers will face when they return from various destinations.
