The UEFA Champions League is an annual club football competition organized by the Union of European Football Associations (UEFA). It is contested by top-division European clubs, deciding the winner through a group and knockout format. This match is a round of 16 fixture. - Barcelona and Benfica are competing in the Champions League round of 16. - The first leg of the match is being held in Lisbon at The Estádio da Luz. - Barcelona beat Benfica in a nine goal thriller the last time they played. - Hansi Flick's Barcelona has their sights set on the quarter-finals.