"We will continue to strongly encourage booster shots as the most effective protection," the league added in its memo.
NFL officials also said they are looking into adjusting "return-to-participation requirements for those who have recovered from COVID-19" -- potentially opening the door for players to see the field sooner following a positive COVID test.
Of course, this all comes on the heels of the NFL seeing teams lose some of their biggest stars due to the virus -- with players like Jalen Ramsey, Odell Beckham Jr. and Baker Mayfield having all been sidelined this week due to positive tests.
The NFL contends that the changes it's proposing are grounded in data and backed by science, and that the safety of its players, coaches, personnel, and entire NFL community is the No. 1 goal.