The 34-year-old former Netherlands international, who regained consciousness and was carried off the field, later said on NEC's social media that he was feeling good.
Bas Dost collapsed on the field and was immediately helped by all the emergency services present," NEC said in a statement on their website.
"Dost was carried from the field by the emergency services and taken to hospital."
Players from both teams stood around Dost, who scored the opening goal and provided the assist for NEC's second, while he was being treated.
AZ posted a message saying: "Bas Dost is fortunately conscious.
Persons:
Dost, Annegret, Bas Dost, Ken Ferris, Stephen Coates
Organizations:
Soccer Football, Leipzig, Club Brugge, Red Bull, Brugge's, REUTERS, NEC Nijmegen, AZ Alkmaar, NEC, Thomson
Locations:
Leipzig, Germany, Bas, Netherlands