MADRID, Oct 31 (Reuters) - Real Madrid's Spain midfielder Ruben de la Red was released from hospital and flew back to the capital on Friday, after collapsing during his side's 3-2 defeat away to Real Union in the King's Cup.
In the 13th minute of their last-32 first leg in Irun on Thursday, De la Red was running back to towards the halfway line when, without anyone in close proximity, he suddenly fell face first on to the pitch and lay motionless.
Medical staff were quickly in attendance and the 23-year-old showed signs of movement as he was carried off on a stretcher.
He regained full consciousness in the dressing room and was taken to a local hospital where he stayed overnight under observation.
"It appears that he fainted due to the physical effort he was putting in," Real's head of medical services Carlos Diez told reporters on Thursday evening.
"All tests at present are normal and he is without any problems."
The player will undergo further tests in Madrid.