The new assistance for match officials will be introduced in Europe's top club competition next season after being rolled out on a continental basis for the first time this summer
UEFA has approved the use of goal-line technology (GLT) at the European Championship in France later this year as well as in next season's Champions League.
The decision, announced following the governing body's executive committee meeting in Nyon, means the system will work alongside additional assistant referees who will "continue to monitor all activity in and around the penalty area".
"It's not a decision taken quickly.