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An additional fourth substitute will be allowed in extra-time in matches played at this summer's Rio Olympics and at the Club World Cup later in the year.
The game's law-making body the International Football Association Board (IFAB) approved trials of an extra substitute when games go into an additional half-hour, and the executive committee of football's world governing body has now announced plans to introduce it into a number of its competitions.
A FIFA statement read: "Following the recent decision by the IFAB to allow experimentation with a fourth substitution in extra-time, the FIFA executive committee agreed for such experiments to be conducted this year at the Olympic football tournaments, the FIFA Under-20 Women's World Cup in Papua New Guinea and the FIFA Club World Cup in Japan."
The FIFA ExCo was meeting for the final time before it is replaced by the new-look FIFA Council at the organisation's next Congress in Mexico in May.
It also supported the governing body's efforts to reclaim funds lost due to the corrupt conduct of former FIFA members, agreed kick-off times for matches at the 2018 World Cup in Russia and approved the 2015 financial and governance report.