The government has confirmed they are looking at using vaccine passports for large events such as football matches in the UK.
Vaccines Minister Nadhim Zahawi has previously said the idea was "discriminatory" but today confirmed the government was exploring the idea.
Speaking on BBC Breakfast he said: "We are exploring through the different pilots that we are running, certainly for mass events which could prove more challenging for us to open up, say, Wembley Stadium for the semi-final of the FA Cup or the final.
"If you want to go to 100% seat capacity at Wembley, you have to look at all these technologies which are available to you and I think it is only right and responsible for any government to explore that.
"Michael Gove is reviewing how we would do that - there are some very important questions that people will be clearly worried about, including issues around discrimination and we can't be discriminatory in any way on this.
"Hence why, domestically, it is something that we have to explore, we have to be able to answer those questions.
" Internationally, it is right to make the certification available for our citizens and to shape the protocols around the world because clearly a number of countries are going to do this - we'd much rather do it in a co-ordinated way, which is what (Transport Secretary) Grant Shapps is trying to do at the moment and he is chairing the G7 meeting of ministers on this."
Yesterday Mr Shapps confirmed that the NHS app would be used to provide a vaccine passport for international travel.
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."
