Wilken, who joined Usuthu in February 2016, served as youth coach and team analyst at the Durban-based outfit.
According to his Linkedin profile, he will now perform the latter role for the Milutin Sredojevic-led Buccaneers.
AmaZulu and Wilken confirmed the move on Twitter.
The Sea Robbers started pre-season training on Monday.
All the best Darian! https://t.co/Ek0DesiRoG— AmaZulu FC (@AmaZuluFootball) June 21, 2018