Sepp Blatter has suggested the trial introduction of a television replay system that would allow coaches and managers to challenge refereeing decisions "twice or once" per half.
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In a pre-recorded address to the Soccerex Global Convention in Manchester on Monday, the FIFA president said such challenges could only be made once the officials had stopped a game.
He said the trials could happen as soon as next year, possibly in a FIFA youth competition.
"They [managers and coaches] have the right in the half, twice or once, to challenge a refereeing decision -- but only when the game is stopped," Blatter explained.
"Then, there must be a television monitor but [manned] by the television company and not by another referee.
"The referee and the coach will go to look and then the referee can change his mind, as it is the case in tennis.
"It can only be done where there is television coverage of all the matches, or we can try it in a FIFA competition, a youth competition, like when we are in New Zealand next year."