Erik ten Hag, the man widely tipped to become the next Manchester United manager, suffered defeat on Sunday when his Ajax team lost 2-1 to PSV Eindhoven in the Dutch Cup final.
Ajax opened the scoring through Ryan Gravenberch in the 23rd minute before Dusan Tadic saw a goal ruled out just before half-time.
PSV then hit back with two goals in quick succession through Erick Gutierrez in the 48th minute and Cody Gakpo two minutes later.
For PSV, it was a first Cup triumph since 2012 and their 10th overall.
Defending champions Ajax, the 20-time cup winners, are still on course to the Dutch league. They hold a four-point lead over PSV.
Ten Hag is reportedly the overwhelming favourite to take over at Manchester United next season.
The 52-year-old Ajax manager is seen as fitting the profile the United board desire to restore the glory days the club enjoyed under Alex Ferguson.
