One of the greatest footballers of all time, Argentina-born Di Stefano was taken to the intensive care unit of Madrid's Gregorio Maranon hospital after an 18-minute respiratory arrest, said the sources who declined to be identified.
Known as 'La Saeta Rubia' (the blond arrow), he has had several health problems in recent years and is often seen in a wheelchair in public.
Di Stefano was fitted with a pacemaker in 2005 following heart surgery.
His achievements as a player helped turn Real, the club he joined in 1953, into one of the world's leading sides.
The skilful Di Stefano featured in attack when the Madrid team won five successive European Cups between 1956-60 and he scored in each of the finals.
(Reporting by Julien Toyer, editing by Tony Jimenez)
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