After all, club record signing Mohamed Salah completed a move from Roma this summer and can play there, as can Sadio Mane - who made the PFA team of the year in 2016/17 after a superb debut season at Anfield.
"I know that when we go out onto the pitch we are united".
The Spain global impressed under Zinedine Zidane last season but didn't get regular game time.
The 25-year-old actually signed the deal in July, before heading to the U.S. for Real's pre-season tour, but it was agreed not to make the extension public until this month. The second leg will be at the Santiago Bernabeu on August 16. "He's a player I'm very fond of", Zidane said at the start of February.
While the 21-year-old - who joined Los Blancos from Real Mallorca in 2015 - does not want to leave the Estadio Santiago Bernabeu, he is prepared to if manager Zinedine Zidane cannot offer him assurances of more game time.
He then backed that up with a La Liga and European double in 2016-17 - Real's first since 1958.
Thomas Vermaelen and Rafinha Alcantara are expected to be the only Barcelona absentees to face Real Madrid, with the latter having been out of action since undergoing a knee operation in April.
Zidane's team outclassed Manchester United 2-1 to win Tuesday's UEFA Supercup in Skopje, meaning Madrid have won six trophies in the Frenchman's 20 months in charge, including back-to-back Champions Leagues and the 2015-16 La Liga title.
The attacking firepower of their second string has been somewhat weakened by the departure of Alvaro Morata and James Rodriguez, however, as the pair scored a combined 31 goals in all competitions last term.