Multiple general managers and other player personnel executives recently told The Times they were concerned that different rules were being applied to different teams, depending on advisories from state and local officials.
Canadian receiver Chase Claypool impressed NFL scouts at the league's combine in February and its translated into draft hype which could result in a first round selection.
The NFL draft will be held as scheduled, but not as planned. The draft is still expected to be televised. The NFL said last week that it is exploring "innovative options for how the process will be conducted and will provide that information as it becomes available", via NFL.com's Dan Parr.
The directives will be reviewed on April 8 after consulting public health authorities and medical experts.
"The challenges we face are not unique - many businesses and individuals throughout the country are experiencing and addressing similar issues", Goodell wrote in the memo.
The 2020 National Football League season is due to begin on 10 September. Teams are free to continue normal business operations, the report said, and free agency has continued apace, even with players previously prohibited from visiting team facilities.
As of Wednesday morning, more than 55,000 cases have been reported in the USA, with 801 deaths and 354 people recovered, according to Johns Hopkins University, which has been tracking the outbreak using combined data sources.