After victory in El Clasico last week, Los Blancos took the lead in the La Liga title race, but following the Blaugrana’s narrow win over Real Sociedad on Saturday, their 2-1 loss in Seville last night sees them trail by two points with 11 games remaining.
Karim Benzema had cancelled out Sidnei’s opener for the Andalusians, but Christian Tello delivered the fatal blow with eight minutes remaining.
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And after the La Masia graduate dented Real’s title hopes, Ramos conceded Zinedine Zidane’s side lacked intensity.
“We relaxed a bit at the back. We should have had more intensity, fought harder, but we didn’t,” Ramos said.
“There are 11 games to go and many points still to play for. If we want to be champions, we can’t let opportunities pass us by.
“We know this is a tough place to come against a good side. We’ll reflect on it to come back stronger.
“Just like we didn’t lose our heads over last week’s three points against Barcelona, we can’t get too worked up about this either.
“The result (against Betis) is quite fair, we have to look at ourselves. We haven’t been good today. But there’s a lot still to play for in LaLiga.”
Real host Eibar on Friday with a chance to go back to the top of the table, before their decisive second leg against Manchester City at the Etihad on Tuesday.