The NFL is considering adding a "booth umpire" and a senior technology adviser to the referee to assist the officiating crew.
The league also is looking at other rule changes, including an alternative to the onside kick.
NFL clubs received a list of potential rule changes on Thursday.
Owners will vote on the proposals at the upcoming league meeting to be held by video conference on May 28.
A "booth umpire" would serve as an eighth game official.
