Today's front-page headlines from Marca, AS and Mundo Deportivo.

The great challenge

Florentino challenges the Real Madrid team to do what no one has - retain the Champions League

The champions begin their title defence

Saul lays down the law of Atletico

Celtic pay for the Alaves win

Champions begin title defence

Bale/Benzema/Ronaldo to start for Real Madrid

Asensio and Isco fall from the list

Jorge Jesus: 'Madrid are the best team since Zinedine Zidane arrived'

Saul secures three golden points - Griezmann and Filipe Luis excellent, Oblak saves penalty

A Barca exhibition against Celtic

Sampaoli: 'Luckily football is a collective sport, if it were individual we'd have a problem'

Golden blondes

Messi gets a hat-trick and Neymar grabs four assists

A Suarez double, an Iniesta goal and Ter Stegen penalty save complete a 'perfect' performance

Ceferin to be elected as new UEFA president

Saul's goal put's Atletico into the ascendancy