The NFL and NFLPA have both acknowledged that important CBA negotiations are on the horizon as they handle financial adjustments due to COVID-19.
The league and NFLPA are studying how the revenue could be affected and what the sure-fire losses will look like.
The salary cap (currently $198.2 million for 2020) is calculated based on expected revenue, but there's also a mechanism where it rises or falls based on unexpectedly higher or lower revenue in the previous season.
The worst-case scenario is that every game is played in a completely empty stadium, leading to what sources have estimated as a $4 or $5 billion drop -- about a third of revenue.
The two sides agreed to a new CBA shortly before the start of the COVID-19 pandemic.