Marais has undergone a disastrous season in charge of the Bulls, but was kept in the structures when the appointment of John Mitchell as Executive: Rugby was made by the rugby franchise last week.
The Bulls coach will continue coaching the team into the Currie Cup season while Mitchell will take over for the Super Rugby season next year.
Marais said he had made mistakes – primarily allowing others to influence his thinking – and he was warned by former Springbok coach Heyneke Meyer as he let certain parts of the process fall under the control of others.