RELATED: CoronavirusNOW.com, FOX launches national hub for COVID-19 news and updates“There’s no finish line with health and safety and I think these protocols are very much living and breathing documents, which means they will change as we gain new knowledge about this virus, as we gain new knowledge about transmission, as we gain new knowledge about testing and there are new tests and new techniques that come online,” Sills said. “We very much anticipate that these protocols will change.”AdvertisementThe NFL has sought input from other leagues that have already returned to action, including leagues outside the country.