Real Madrid’s honorary president and former player Alfredo Di Stefano has undergone bypass surgery, four days after suffering a severe heart attack.

The 79-year-old Di Stefano was in a “postoperative stage of observation,” the press office at La Fe Hospital in Valencia told reporters.

Di Stefano had the attack on Saturday, but surgery was delayed because he was suffering from a fever.

Di Stefano was European player of the year in 1957 and 1959. Di Stefano won five consecutive European Cups with Real Madrid and eight Spanish league titles.

He became Real Madrid’s honorary president in 2000.