ENGLEWOOD, Colo. — The NFL and NFL Players Association have agreed on a format for the voluntary offseason program, according to a memo sent to NFL clubs.

Beginning on April 20, teams are able to hold three weeks of virtual work that includes classroom instruction, guided workouts and non-football educational programs.

"Both our Executive Committee and Board of Player Reps have voted unanimously to approve a virtual offseason program up until the start of training camp," the NFLPA said in a statement. "We will be sending out all the details and setting up calls with players and agents for how this will work shortly."

The virtual program remains voluntary.

No team is permitted to begin on-field work or reopen their facility until all 32 teams are able to reopen. Local, state and federal regulations will be observed by all clubs in determining when they would be able to reopen.

If and when facilities do reopen, the existing collective bargaining agreement rules will apply.

The Broncos and other NFL clubs may also be able to hold a mandatory veteran minicamp with two hours of classroom instruction and two hours of workout time if facilities remain closed, according to NFL Network's Tom Pelissero.

For the workout portion of the offseason program, teams are permitted to send a limited amount of equipment to their players, according to Pelissero. Loren Landow, Denver's head strength and conditioning coach, previously outlined the Broncos’ plan for Phase I of the offseason program.