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During the reserve team match with "Vitesse" in Amsterdam, "Ajax" defender Evander Sno suffered a heart attack.
The unconscious footballer had to be revived three times with a defibrillator.
In the hospital, the 23-year-old Dutchman regained consciousness and communicated with doctors.
"Luckily our doctors reacted very quickly," Ajax coach Albert van der Dussenas told the AD newspaper. "They worked heroically and saved Sno's life."
The defender appeared on the field in the second half and managed to play for 18 minutes.