The England and Wales Cricket Board (ECB) is looking at the possibility of using coronavirus passports to allow fans into County Championship games this summer.
The new domestic season, which is due to start on April 8, will not have fans in attendance until at least May 17, in line with government guidelines and the roadmap out of lockdown.
In order to see the return of fans at grounds as soon as possible, the ECB is looking into every measure available, including the use of a passport to prove that an individual has received a vaccine.
"There has been a lot of talk. We have gone from no passports to suddenly now looking at a Covid certification," said ECB's managing director of county cricket Neil Snowball.
"We will explore anything that enables us to get our members back and our spectators back. At the moment it looks like that might happen.
"If you look at the June 21, it is going to be a question of balancing three things. One, if there is going to be some sort of passport or Covid certification, second is testing, third is some sort of social distancing and we have said we will do whatever we are asked to do to make sure we can get the maximum number of people back.
"The ideal would be some sort of certification with an element of social distancing and probably wearing masks.
"The first lot of games will be behind closed doors. From May 17, as per the roadmap, we can get the venues back to 25 per cent and that is exactly what they are gearing up for.
"We are trying to be as optimistic as we can about June 21, the demand for tickets has been huge and venues will be trying to get maximum crowds in.
"We will know about a month out. I am really hopeful we can get significant crowds back."
Author: Jake Wilkin