SACRAMENTO -- The dark cloud hanging over the Sacramento Kings got a little darker Wednesday night.

Legendary NBA coach and two-time cancer survivor George Karl told The Sacramento Bee that he is undergoing a cancer-related procedure on his throat Thursday morning and will miss practice.

While Karl confirmed that the surgery wasn’t serious, his availability over the next few days is unknown.

“Coach told me the other day,” General Manager and President of Basketball Operations Vlade Divac told The Bee. “I told him to take as much time as he needs ... We probably won’t know the results for a couple days.”

Karl, 64, is in year two of a four-year deal with the Kings. He underwent treatment for throat cancer in 2010 after fighting through prostate cancer in 2005.

If Karl isn't available for Friday night's game against the Orlando Magic, associate head coach Chad Iske will take the helm for the struggling Kings.