There are several ways the impact of covid-19 can be reduced on football, but I think some few ways include;

Quarantine the players or isolate the players
one of the ways I think covid-19 impact can be reduced on the football is to put the players in isolation. Preventing them from coming into contact with people will go a long way to help them not to get the virus talk less it having effect on them.

Assuming players are allow to come into contact with players only and if none of them is having the virus it will be quite difficult for them to get and it having effect on the team.

Ensuring that fans wear face mask and observe all the covid-19 protocols in the stadium
It will be appropriate and will help if fans are been enforced by the authorities to observe all the covid-19 protocol in and around the stadium like wearing of face making, washing and sanitizing the hands.

Vaccination
I think if all players are vaccinated it will go a long way to help prevent players from getting the virus.