4-2-3-1 wide
Julen has used this formation once against Girona this season, which certainly did not backfire. In fact, they won the game 4-1 against the team who they had lost 2-1 to, last season.
Real Madrid is doing as great as before in a 4-3-3 formation, however, there is a possibility that Julen might switch to a 4-2-3-1 system and make it the default one. Because this formation provides the team with a lot of stability, and it maintains balance in both the attacking and the defending department as well.
With Benzema up front, the middle 3 will likely consist of Asensio Modric and Bale, with Casemiro and Kroos playing as a double-pivot. This formation has brought them positive results, but they are yet to face a top opponent in La Liga.