The NFL formally announced the introduction of the reserve/Covid-19 list on Sunday. By the end of the day, six players were added to it. Another 18 players were announced as being placed on the list by the end of Monday. For 28 teams, the vast bulk of their rosters are scheduled to report for Covid-19 testing today, after which we should anticipate dozens more being added.
Up to this point, outside of a few teams, only rookies and quarterbacks have reported to training camp so far to be tested for a first time for Covid-19. The rest of the rosters report only on their assigned date, which is July 28.