FIFA's chief medical officer Jiri Dvorake says referees are part of the game and should be treated like players.
Dvorak tells FIFA's medical conference there is no indication of a doping problem among referees "but it's something we have to consider."
FIFA also was asked to advise the World Anti-Doping Agency on when players serving doping bans should be allowed to return to training with teammates.
Current WADA rules prevent suspended players working with their teams — effectively extending their ban if they are not match-ready immediately after completing a ban
WADA director general David Howman acknowledges that penalties can be harsher for team players than for individual athletes.