Starting from the third round additional officials will be used to review potentially contentious decisions, it was confirmed at the annual meeting of the International Football Association Board (Ifab) on Friday.
Use of VAR is set to remain in the trial phase until at least 2018 but the system could also be trialled at this summer’s Confederations Cup in Russia.
The Ifab board meeting, chaired by FA chief executive, also unanimously approved plans to allow countries to introduce extra substitutes and sin bins in grassroot and amateur games.
This year’s FA Cup will also see teams being allowed to field fourth substitutes in the final three rounds should their game go into extra time.
"With the Cup now adopting a straight knockout format from the quarter-finals onwards, the introduction of a fourth substitute in extra time will bring extra intrigue and interest," Glenn said.
Ifab, world football’s rule-making body, is made up of the football associations of England, Wales, Scotland and Northern Ireland as well as four representatives from Fifa. A three-quarters majority is required for any decisions.