With wife Ashley Kerr due to give birth, Oklahoma City coach Mark Daigneault said that he won't accompany the Thunder on a three-game trip starting Friday in Milwaukee.
Assistant coach Dave Bliss will take over as acting head coach.
After Friday's game against the Bucks, the Thunder visit the Boston Celtics on Saturday and the Atlanta Hawks on Monday.
The team returns to Oklahoma City vs. the Utah Jazz on Wednesday.
The Thunder are 6-8 this season and are 10th in the Western Conference.