The COVID-19 pandemic has already had myriad effects on the 2020 NFL season (assuming we get one): remote draft, virtual offseason, canceled preseason. Another effect that is making waves this week is player opt-outs.
Basically, any player can opt out of the 2020 season either voluntarily or as a “higher-risk” player. The contract and financial ramifications are different depending on the type of opt-out. You can read about the particulars and see the current list of opt-outs here:
https://www.nfl.com/news/list-of-nfl-players-to-opt-out-of-2020-season
There hasn’t been a superstar-type player to opt out (yet), but there are still some important players.