Video Assistant Referees (VAR) will be used in the Champions League from the 2019-20 season and will also be introduced at the 2020 European Championship, UEFA said on Thursday.
European football's governing body revealed a decision had been taken at a meeting of their executive committee to bring in the technology, which will be used from the play-off round preceding the group stage of the Champions League.
UEFA's move follows the use of VAR at the FIFA World Cup in Russia, when it was deemed largely to be a success.
UEFA announced the news on Twitter Account.
VAR will also be used in the Europa League, but not until the 2020-21 season and only from the group stage, and in the finals of the new international Nations League competition, although only from 2021.
"We're confident that introducing VAR in August 2019 will give us enough time to put in place a robust system and to train match officials to ensure an efficient, successful implementation of VAR in the UEFA Champions League, the world's flagship club competition," UEFA president Aleksander Ceferin said.