Fourth substitution in extra time to be trialled at Olympics

Olympic football substitution
The Olympic football tournament runs from 3 to 20 August

Teams will be able to make a fourth substitution in extra time during the Olympic football tournament in Rio, as part of a trial by governing body Fifa.

The trial will also extend to the Under-20 Women's World Cup in November and the Club World Cup in December.

The move comes after the International Football Association Board (IFAB) approved a trial of the use of video assistant referees.

The Olympic football tournament runs from 3 to 20 August.

Both are part of a comprehensive revision of the Laws of the Game, the most comprehensive review undertaken during the IFAB's 130-year existence.

Fifa is trying to establish whether a fourth substitution would be used tactically or for player welfare.external-link

It will also examine whether the additional substitution could have an unfair impact, as all four substitutes could be used in extra time, changing more than a third of team.