MMAJunkie reported the change, and indicated that the original fight will be re-booked for another event.
Last season, Konrad bested Rogent Lloret, Damian Grabowski and Neil Grove to win the inaugural Bellator heavyweight title. His fight with Buentello was set to be his first fight since winning the belt last October.
Buentello has fought for both the UFC and Strikeforce title. In his last fight, he took a decision victory over Kerry Schall. He also holds victories over Carter Williams, Kirill Sidelnikov and Mike Kyle.