Ajax midfielder Abdelhak Nouri suffered “serious and permanent brain damage” after collapsing in a friendly match on Saturday.
The 20-year-old had “cardiac arrhythmias” – heart rhythm problems – during the game against Werder Bremen.
The club statement said the chance of recovery from the damage is nil.
The Amsterdam-born player was flown by helicopter to hospital in Austria – where the abandoned friendly match was being played.
Former Manchester United and Fulham goalkeeper Edwin van der Sar, now CEO at Ajax, said: “This is the worst possible message. It is terrible. We feel enormously for his parents, siblings and other relatives.