Barça was suffering against Madrid, but Valverde introduced two changes that turnaround the match
Barça was dominating Real Madrid in the first half. Julen Lopetegui reacted and introduced Lucas Vázquez as a wing and Madrid played with just three defenders. Madrid scored the 2-1 and in just 10 minutes they were near to equalize. The huge pressure forced Barça to play long balls and Valverde took advantage of that introducing Dembélé and Semedo. More speed in the pitch to punish Real Madrid in the counterattack.
Valverde's plan worked and after Benzema missed a heading, Suárez did not and scored the 3-1. Then, Barça became rampant againt and could beat Madrid easily with more spaced and speed.
Without Leo Messi, Barça need a leader. We talked about Coutinho or Luis Suárez step forward. However, Ernesto Valverde has been the first one to become a leader for the team.