Health checks and Sanitization for fans
The scientists have come up with novel ways of sanitizing people and checking their health in times of need. When and if the fans are allowed to visit the stadiums to enjoy the matches, something that is possible, only when the pandemic has died down or some sort of containment has been found, one might see ways to keep fans and other officials safe.
"Sportsman don't need crowd to be spurred on" - Ian Chappell on cricket behind closed doors
One such way this could be done is by checking the temperatures of the fans before entering the stadium and while exiting. This should be done alongside sanitizing them by the way of putting up a tunnel through which they need to enter the venue, in which they are sprayed with a sanitizing solution. This has to be done while going in and coming out of the matches.
As they say, precaution is better than cure.