Going to be interesting to see how they manage it. A lot of countries still have travel restrictions, including mandatory 14 day self isolation on arrival (for whatever reason).
If they have to fly out a team of referees 2 weeks in advance so they can do the 14 days self isolation and then those referees have to do 14 days self isolation on their return to their respective home countries that is going to cause all manner of issues. Our 20/21 season commences 2nd Aug for the NBII and 15th Aug for the NBI & there is a strict 14 days self isolation period on return. I wonder if exceptions will be made/agreed?
The spread of dates is close
8/9/10/11 August: Preliminary round
18/19 August: First qualifying round
25/26 August: Second qualifying round
Presumably any quarantines that applied to referees would also apply to players, and if you have that many 14 day quarantines European/international football won't be possible at all!
I don't think quarantines are likely to generally affect football at the top level.
It will be interesting to see who is used in August for the remainder of EL/CL. The QFs/SFs will only be 1 leg so fewer officials will be required than normal. Some high-profile referees are from leagues that haven't returned (Kuipers, Turpin, Makkelie, etc) and the German league has finished already so some officials might be more up to match speed than others. It will also be interesting ot see if the likes of Kuipers and Brych carry on next season or stop, at least at UEFA level.