SEVILLE, Spain (Ticker) - Sevilla wing-back Antonio Puerta is sedated and in intensive care after collapsing during Saturday's Primera Liga game against Getafe.
The 22-year-old was able to walk from the pitch at the Ramon Sanchez Pizjuan after being attended by medical staff who prevented him from swallowing his tongue.
He collapsed again in the changing rooms and was given cardiac resuscitation before being taken to hospital.
"The patient, Antonio Puerta, continues to be in the intensive care unit under sedation, connected to a ventilating machine and with hemodynamic instability," according to the latest report, issued by the Hospital Virgen del Rocio on Sunday.
"The next medical report will be given tomorrow if there are no new incidents."
The first medical statement on Saturday said the player's condition was "very serious."
"The player was admitted at 2253 hours," the statement read. "He was transferred to the intensive care unit where he has been given assisted ventilation and is experiencing hemodynamic instability. The prognosis is very serious."
Sevilla coach Juande Ramos was in no mood to talk about his side's 4-1 win after the match.
"I don't have the mind to speak now. The reason I am here is because we are all professionals, but I have no desire to talk of the game or anything," Ramos said.
"I would like to see the player. The game does not have any importance compared with the health of a player."
Sevilla midfielder Renato Dirnei was equally as worried.
"We were very frightened, but the doctors knew what they were doing," Dirnei said. "It was difficult to continue playing. This victory is dedicated to Puerta."
Sevilla midfielder Sergio Duda said the team was finding it "very difficult" at present.
"The atmosphere is not too good, nobody has the desire to talk," Duda said. "We all want him to recover quickly."
Thierry Henry's debut ended in disappointment as Barcelona was unable to beat 10-man Racing Santander in a goalless draw on Sunday.
Nou Camp coach Frank Rijkaard started with last season's trusted trio of Ronaldinho, Samuel Eto'o and Leo Messi, although Henry came off the bench and almost won it late on with an effort which came back off a post.
But despite Santander having its own debut striker - Ebi Smolarek - sent off for a cynical foul on Eric Abidal, Barca was unable to find a winner.
Villarreal continued where it left off last season with a comprehensive 3-0 win over nine-man Valencia.
In a battle between last season's fourth and fifth-placed sides, the "Yellow Submarine" earned a victory which took their run to nine consecutive La Liga wins.
Denmark striker Jon Dahl Tomasson opened the scoring in the 17th minute and after Valencia's David Villa was given a second yellow card for a dive just before the interval, Villarreal doubled its advantage through debutant Giuseppe Rossi's second-half penalty.
Shortly after that, Valencia lost Joaquin to another red card before Santi Cazorla completed the rout.
Recreativo Huelva proved last season was no one-off as it dominated Real Betis in a lively 1-1 draw.
Recre only narrowly missed out on a European spot in their first season back in the Spanish top flight, but despite losing their coach and several top players, they enjoyed the greater share of possession and chances.
Florent Sinama Pongolle fired Recre into the lead and they were unlucky only to get a point after Victoriano Nano equalized four minutes before the break.
Ariel Ibagaza scored twice as Real Mallorca started its season with a 3-0 win over Levante 3-0.
Ibagaza began the scoring with a penalty midway through the first half and after new recruit Daniel Guiza doubled the lead after 57 minutes, Ibagaza grabbed his second with 18 minutes remaining.
Espanyol slipped to a disappointing 1-0 defeat against newly-promoted Real Valladolid.
In the 54th minute, Daniel Kome charged down the right and pulled the ball back from the byline to a grateful Joseba Llorente, who blasted home from close range.
Athletic Bilbao and Osasuna drew 0-0, Aitor Ocio's last-minute red card the only meaningful action, while Almeria enjoyed a great return to the Primera Liga with a stunning 3-0 success at Deportivo La Coruna.
Alvaro Negredo gave the visitors a 19th-minute lead which Fernando Soriano doubled 11 minutes from half time before Albert Crusat settled the contest in the 50th minute.
On Saturday, Real Madrid began the defence of its Primera Liga title with a 2-1 victory over city rivals Atletico Madrid at the Bernabeu.
Atletico took the lead inside the opening minute through Sergio Aguero, but Real hit back to take the points through goals from Raul and Wesley Sneijder.
Newly-promoted Murcia got its Primera Liga campaign off to a winning star, beating 10-man Real Zaragoza 2-1.
All three goals came from debutants as Alvaro Mejia opened the scoring in the 18th minute before Ricardo Oliveira equalized. But Oliveira's Brazilian countryman Fernando Baiano grabbed the winner.