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.