Real Madrid great Alfredo Di Stefano remains in a stable condition in hospital after suffering a heart attack on Saturday.
The 88-year-old is being kept in an induced coma in the coronary unit at the General Universitario Gregorio Maranon Hospital.
The latest medical report, which Madrid published on their official website on Sunday, read: "The patient, Alfredo Di Stefano, 88-years-old, admitted to the coronary care unit, remains in the Cardiology Department at the Gregorio Maranon Hospital after suffering a cardiac arrest.
"The patient remains clinically and haemodynamically stable, but his condition remains serious."
According to reports in Spain, Di Stefano was on a street close to the Bernabeu when he had the heart attack - a day after his 88th birthday. The hospital said the emergency services were able to stabilise him.
Madrid confirmed on Saturday evening that Di Stefano was under sedation, with endotracheal intubation and artificial ventilation, and was being subjected to the relevant clinical trials.
Club president Florentino Perez had visited Di Stefano at the hospital.
Di Stefano is one of Madrid's finest ever players. He was central to the club's domination of European football in the 1950s, helping them win the European Cup for five straight seasons from 1956 to 1960.
The Argentina-born former forward played for the club from 1953 to 1964, winning eight Primera Division titles.
He is Madrid's second highest scorer in history, behind Raul, with 307 goals in all competitions.
He also had two short spells as coach of the club and is their honorary president.
Internationally, he played mainly for Spain but also represented Argentina and Colombia.