The decision to resign is due to the appointment of former coach Muhsin Ertugral as the new Technical Director.
Versleijen said in a statement to media:
"With the latest turn of events where the club appointed a new Head of Technical, which I did not agree with, I have made the decision to step down as the head coach of Ajax.
“Further, I am very disappointed in the manner in which I found out about this new appointment of Head of Technical
“I would like to thank the club for the opportunity afforded to me and I wish the club and its supporters the very best with their current challenge in saving relegation and its future.”