Premier League referees have been set a weekly training schedule which they must complete at home with their performances being monitored from afar by the PGMOL.
Sports scientists are tracking their data after telling officials, such as Mike Dean, Michael Oliver and Martin Atkinson, to wear heart-rate monitors during exercise.
Each is expected to have to pass a fitness test before being assigned a game once the suspension on the Premier League season is lifted.
Once a date is set for the 2019-20 campaign's restart, and when the UK Government allows, officials will meet for a crash course reminder in VAR.