BT Sport has extended its deal to show exclusive coverage of both the UEFA Champions League and Europa League until 2021.
The new deal is thought to be worth £1.2 billion.
BT Sport began showing the matches from both competitions in 2015 following an original deal worth £897 million.
The new deal gives BT Sport exclusivity across all live games and highlights for the first time - meaning ITV will no longer broadcast a weekly highlights show.
BT has pledged to enhance its social media coverage of both competitions by making clips, weekly highlights, UEFA’s magazine show, and both finals available for free on social media.
BT streamed both 2016 finals on YouTube for the first time, taking the number of people who watched BT’s live coverage of the finals to more than 12 million.
John Petter, consumer CEO at BT, said: “We are delighted to have renewed these rights. The UEFA Champions League and UEFA Europa League are two of the best competitions in the world and we would like to thank UEFA for choosing us as their exclusive broadcast partner in the UK."
Guy Laurent Epstein, UEFA marketing director, added: “UEFA is delighted to have extended the relationship with BT Sport for a further three seasons, taking our partnership to 2021. BT Sport has proved to be an innovative broadcast partner, pushing the boundaries and covering the UEFA Champions League and UEFA Europa League in new ways.
"BT has delivered strong audiences in the UK and we are excited about their future plans for the use of social media which will engage a growing fanbase that consumes sport in different ways.”