McKenzie, 55, has been the Raiders GM since 2012. He was signed through next season as part of a four-year extension he signed in 2016.
The Raiders were 39-70 with McKenzie as GM, 29th in the NFL during that time span
McKenzie was given the chance to finish the season but is not expected to do so, according to NFL reporter Ian Rapoport.
This is part of the ongoing shakeup with the Oakland Raiders who at 3-10 share the worst record in the NFL.
NFL Network first reported the news of McKenzie's firing.
See more stories, photos and videos on the Raiders here.
ESPN has contributed to this report.