Five substitutes will be allowed next season, football lawmakers have announced following a meeting of the International Football Association Board (IFAB).
However, each competition will be free to decide whether they want to use the additional substitutes next season.
The measure, designed to help manage player workloads in seasons affected by the coronavirus pandemic, initially covered competitions finishing in 2020.
A statement from IFAB said: “Following the decision taken on 8 May 2020 to give competitions scheduled to be completed in 2020 the option of allowing teams to use up to five substitutes, The IFAB Board of Directors had agreed to review whether to extend this option further.
“On the basis of this in-depth review based on stakeholder feedback and analysis of the impact of COVID-19 on competition calendars, The IFAB Board of Directors has approved to extend the option to competitions scheduled to be completed by 31 July 2021 and international competitions scheduled in July/August 2021.
“The main reason for the temporary amendment to Law 3 – The Players was the impact on player welfare of competitions being played in a condensed period and in different weather conditions.
“The recent review has shown that the reasons for the temporary amendment remain valid and the impact on player welfare is likely to continue into 2021.”