The youngster has agreed to a six month loan with the Eredivisie club.
Crowley was undergoing a medical last night, which should be completed today - and will see Go Ahead Eagles finalise the necessary contracts.
Hans de Koning wants Crowley fit and ready for the resumption of the league against AZ Alkmaar in a fortnight's time.
"Then (Crowley's deal) we will be ready. I want a full squad to fight AZ," he said.