Saturday's result leaves Real Madrid seven points behind league leaders Atletico Madrid, who have two games in hand and just a point ahead of Sevilla, who won away to Eibar earlier in the day
Zinedine Zidane rested some first-team regulars, but a side containing Lucas Vazquez, Marcelo, Isco and Casemiro should still have been far too strong for their rivals.
Sevilla, on Saturday, dominated the ball for nearly all of their game against second division Leganes, but it wasn't until five minutes from time that the Argentinean's strike broke down their stubborn rivals, reports Xinhua news agency.
Real Sociedad had lost their previous 24 league visits to the Camp Nou, but may have thought their luck was about to change when Willian Jose opened the scoring as Portu crossed back into the Barca
I have no explanation for tonight. We've had good and bad moments in games like today's. Especially at the beginning, when they scored a goal after three minutes. We had time to get back into the game and then things
Ferran Torres on Tuesday night became the first Spanish player to score a hat-trick against Germany and it was also the first time Spain have ever scored four goals - let alone six - against Die Mannschaft. Nevertheless
"We had chances in the first half. We needed to the first goal to open up the game and it came from a deep central-position from Eden, who's a player that has the ability to turn rapidly," the club's official website quoted Zidane as saying.
