The Cardinals are parting ways with defensive coordinator Clancy Pendergast, according to a report by the Arizona Republic.
Pendergast had been with the team since January 2004 and was one of two assistants retained when Whisenhunt was hired two years ago.
The Cardinals allowed more points during the 2008 regular season than all but four teams, and their defense couldn't hold a lead in the final minutes of Super Bowl XLII.
It remains unknown whether Pendergast was leaving to take another position or if he had been dismissed, but Whisenhunt is reportedly interested in replacing him with Keith Butler, the former Seattle linebacker who coaches the position for Pittsburgh.
Haley was formally introduced as head coach of the Chiefs on Friday after two seasons as the Cardinals' offensive coordinator.
Information from the Associated Press was used in this report