Real Madrid's Spain international midfielder Ruben de la Red spent Thursday night in hospital in the town of Irun after passing out during the Copa del Rey game between Real Union and Real Madrid on Thursday night.
De la Red fell to the ground unconscious in the 18th minute of the game, which Madrid lost 3-2 against a side in the third tier of Spanish football.
He received attention on the pitch and was then taken quickly to the Hospital Comarcal in Irun, where he was diagnosed as having suffered a syncope, which is a loss of consciousness caused by a lack of blood traveling to the brain.
The player recovered consciousness and at one stage it was thought he would be able to fly back to Madrid with the rest of his companions. However, as a precaution De la Red was kept in hospital so that further tests could be carried out.
De la Red's loss of consciousness brought back memories of the tragic death of Sevilla defender Antonio Puerta last season. Puerta passed out on the field during the first game of the 2007-2008 season on August 25.
Although he walked off the field, he suffered a heart attack in the ambulance taking him to hospital and died three days later.
Following events in Irun, De la Red's long term playing career must now be in doubt.