The reshuffle follows the departure of Saad al-Barrak. He quit as Zain Saudi CEO on Tuesday, having previously also been group CEO of the seven-country operator.
Zain is forecast to make a third-quarter profit of 71.91 million dinars, according to the average forecast of analysts polled by Reuters.
Zain shares were trading down 1 percent at 0650 GMT on the Kuwait bourse.