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Fifa has been trialling a new video review format where managers can hold up a card to request a decision to be reviewed by the referee.
The cards are part of a new system called Football Video Support (FVS) being tested at the Under-20 World Cup and other smaller-scale leagues and tournaments.
A growing number of competitions that do not have the money or resources for full VAR technology are introducing pilot runs for the system that has been described as "cost-effective and scalable" by Fifa.
A card is given to each opposing manager - one blue and one purple - and can only be used by the manager themselves, or another senior team official in their absence. Players can also ask their managers to make review requests.
Review requests can only be made immediately after the incident has occured.
A manager can request a review by twirling their finger in the air and handing their review request card to the fourth official.
It is designed for use in competitions where matches are covered by up to four cameras, rather than the huge multi-camera systems used in the major leagues.
As with tennis and cricket, if a challenge is upheld, the manager would retain two challenges. If they lose, the challenge would be lost.
Fifa states that the system "is used only in the event of a possible clear and obvious error, or serious missed incident in relation to the following scenarios, such as goal/no goal, penalty/no penalty or direct red cards (not second cautions)".
"FVS is a tool to support referees in competitions with fewer resources and cameras. It should not be seen as VAR or as a modified version of it, as it does not include video match officials monitoring every incident," said chairman of the Fifa Referees committee Pierluigi Collina, adding they were "encouraged" by initial results.
Morocco under-20 manager Mohamed Ouahbi challenged a refereeing decision during their World Cup semi-final against France by waving a blue card towards the referee.
Morocco appeals for a penalty were waved away by the official, Ouahbi then held a small blue card in the air, which prompted the officials to review the video evidence. Upon review, the original no penalty decision was upheld, and play was restarted.
Morocco went on to book their place in a first-ever Under-20 World Cup final after winning 5-4 on penalties.
The system has already been tested at the Women's Under-17 World Cup in the Dominican Republic.
Rule maker Ifab - the International Football Association Board - was encouraged by results of early tests.
It will also be utitlised at upcoming Under-17 World Cup tournaments in Qatar and Morocco respectively.
FVS has already been rolled out as a pilot in Italy's Serie C and in Spain for the Women's Liga F and men's Primera Federacion.
A total of 200 matches have already been played using FVS in Serie C, as well as trial weekends in the Italy women's Serie A.
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