Sangalli, 23, had been left out of the Copa del Rey game at Celta Vigo was taking an exam when he began feeling unwell.
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Real Sociedad midfielder Luca Sangalli was taken to hospital after suffering a mild stroke on Wednesday, the Basque club said.
Atletico Madrid climbed to the top of La Liga with a comfortable 2-0 win at home to Real Sociedad on Saturday, easing the pain of their humbling 4-0
Real Sociedad won an edgy derby at Basque neighbours Athletic Bilbao 3-1 on Friday with the help of two converted penalties.
Luis Suarez and Ousmane Dembele scored two quick-fire goals as Barcelona fought back to win 2-1 against Real Sociedad.
Real Sociedad's home turf was once a curse for Barcelona. But the Blaugrana has never been as well-rested following an international break in years.
Everton's Sandro Ramirez will spend the 2018-19 season on loan at Real Sociedad, the La Liga club have announced.
La Liga gave Sociedad permission to play their opening three league games away in order to have time to do the majority of the work.
Sandro, 23, arrived at Goodison Park last summer after scoring 16 goals in 31 appearances for Malaga in the previous season.
Real Madrid defender Theo Hernandez has completed a season-long loan move to Real Sociedad.
Real Madrid have agreed a deal to land Spain right-back Alvaro Odriozola from Real Sociedad, pending a medical.
Llopis worked with Navas at Levante before becoming part of Madrid's staff, helping the Costa Rica goalkeeper to come through some difficult spells.
Real Sociedad have named Asier Garitano as their new head coach.
Barcelona edged past Real Sociedad 1-0 in legendary midfielder Andres Iniesta's final game for the club on Sunday.
Real Sociedad have announced that they will be paying a very special tribute to their longest-serving player ahead of his impending retirement.
Substitute Juanmi struck twice to dent Atletico Madrid's hopes of a top-two La Liga finish as they went down 3-0 at Real Sociedad.
The Basque club made the move after Saturday's 2-1 home defeat to Getafe left them 15th in La Liga, 12 points above the relegation places.
Former Getafe player Moya, 33, had spent the last three seasons at Atletico as back-up to first choice Jan Oblak.
Alonso, who played for Sociedad, Real Madrid, Liverpool and Bayern Munich and won the 2010 World Cup with Spain, retired as a player last May.
Cristiano Ronaldo hit a hat trick as Real Madrid warmed up for their Champions League clash with PSG by convincingly beating Real Sociedad 5-2.