I'm told that it was a health issue and it was a serious health issue that the Spurs dealt with and Gregg Popovich dealt with over the weekend,' Charania said.

Assistant coach Mitch Johnson will serve as interim coach while Gregg Popovich deals with the undisclosed health issue that surfaced before Saturday's game.

Mitch Johnson is stressing a business as usual approach for the San Antonio Spurs while coach Gregg Popovich is out indefinitely while recovering from an illness.