Zinedine Zidane insists Real Madrid are not prematurely celebrating despite taking significant steps towards LaLiga glory in recent weeks.
Barcelona have drawn three of their past four matches, with Madrid winning all of their games across the same period to open up a four-point advantage at the summit.
The Clasico rivals each have 15 points to play for, meaning Barca require a huge swing in the remaining matches, with their derby at home to Espanyol and Madrid's trip to Athletic Bilbao next on the agenda.
Los Blancos last won the title in 2016-17, during Zidane's previous spell in charge, and the head coach is taking nothing for granted.
"The players know that it is a complicated, difficult, long competition, and that those who did it before show that they want to go for everything," he said.
"There is no euphoria here because we have not won anything.
"There is work and commitment to do it well and try to win matches."
Sergio Ramos was Madrid's match-winner against Getafe last time out and he is set to be joined at centre-back by Eder Militao at San Mames.
Raphael Varane was struck in the face by the ball during Thursday's match and was substituted, with the France international suffering from neck pain and unable to recover in time for a place in this weekend's squad.
"He has just arrived, he is working to reach the level of Rafa and Sergio," Zidane said of the 22-year-old former Porto defender Militao.
"Tomorrow he will have to play and I am happy for Mili because he is a player for the present and the future."
Seven of Militao's 12 LaLiga appearances so far this season have been starts, while his fellow Brazilian Rodrygo has only made Zidane's first XI once since the restart and last scored in October.
Nevertheless, the teenage forward produced a lively cameo last time out, asking questions of Getafe before Ramos' 79th-minute penalty.
"He is a player who is changing little by little, working hard," Zidane added.
"He is a charming boy, he is well, and in the end we will take advantage of his qualities."