The International Football Association Board (IFAB) temporarily amended the regulation [Law 3] on substitutions following concerns over player welfare in the post-covid19 era.
The amendments come into effect on 1 June but federations and leagues have an option of resuming leagues with the 2019/2020 rules or to implement the 2020/2021 version.
Below is a summary of changes as they appear on the FIFA website.
Law 3 – The Players – Temporary amendment
Each team will be permitted to use a maximum of five substitutes.
To reduce disruption to the match, each team will have a maximum of three opportunities to make substitutions during the game; substitutions may also be made at half-time.
If both teams make a substitution at the same time, this will count as one of the three opportunities for each team.
Unused substitutions and opportunities are carried forward into extra time.
Where competition rules allow an additional substitution in extra time, teams will each have one additional substitution opportunity; substitutions may also be made before the start of extra time and at half-time in extra time.
The use of return substitutes is not an option for senior competitions.