IRUN, Spain (AP) - Real Madrid midfielder Ruben De La Red will spend the night in hospital for precautionary reasons following his collapse during his team's Copa del Rey match with Real Union on Thursday.
Madrid medical chief Carlos Diez said De La Red suffered a sudden fainting fit brought on by exertion and was not in danger.
Diez said the Spain international has undergone tests which have produced normal results, and was expected to be released on Friday.
De La Red will undergo further tests in the Spanish capital to find out why he fainted, Diez added.
De La Red fell face first as he was walking away from the penalty area in the 13th minute, silencing the crowd at Real Union's Gal Stadium.
The 23-year-old player required treatment for two minutes on the field before being carried off on a stretcher, having appeared to recover consciousness.
Fourteen months ago, Sevilla's Spanish international midfielder Antonio Puerta collapsed during a league game and died three days later after suffering prolonged cardiac arrest.
Madrid lost the fourth round first-leg game against the third-division team 3-2.
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