FK Sūduva is a Lithuanian professional football club based in the city of Marijampolė. Founded in 1968, the club competes in the A Lyga, the top flight of Lithuanian football.

The 2018–19 UEFA Champions League was the 64th season of Europe's premier club football tournament organised by UEFA, and the 27th season since it was renamed from the European Champion Clubs' Cup to the UEFA Champions League. For the first time, the video assistant referee (VAR) system was used in the competition from the round of 16 onward.