UEFA has announced that clubs will be permitted to make a fourth substitution in extra time in the Champions League and Europa League from this season.
The International Football Association Board (IFAB) approved the use of the additional substitute in extra time in March, as trialled over the past two years. UEFA has now decided to adopt the law change for its major club competitions, as well as the Super Cup, Euro 2020 and the UEFA Nations League.
Alvaro Morata was the first-ever fourth substitute, replacing Cristiano Ronaldo in the final of the Club World Cup in December 2016. Russia midfielder Aleksandr Erokhin made history at the World Cup on Saturday when he came on for Daler Kuzyaev in extra time.
UEFA will also permit the "use of electronic and communication equipment in the technical area (small handheld mobile devices), strictly for tactical/coaching purposes and player safety," which was also introduced into the laws of the game by IFAB four months ago.