Who are the most important player in the top teams across Europe. 

The UEFA Champions League is an annual club football competition organised by the Union of European Football Associations and contested by top-division European clubs, deciding the competition winners through a round robin group stage to qualify for a double-legged knockout format, and a single leg final.

The Union of European Football Associations is the administrative body for football, futsal and beach soccer in Europe, as well as Asia's Israel and the Euroasian transcontinental countries of Russia, Turkey, Cyprus, Azerbaijan, Armenia, Georgia, and Kazakhstan.

Антон Зайцев, CC BY-SA 3.0 GFDL, via Wikimedia Commons