Jonathan Feign of the Houston Chronicle reports that Head Coach Kevin McHale has "no idea" when White will join the team.
White told Mark Berman of Fox 26 Sports that the personal matter is related to his previously well documented bouts with anxiety:
"We are trying to figure out a plan for me to be healthy and successful long-term," White said. "It's not really anything that's going on right now. It's more of trying to take a pro-active approach and trying to put together a solid plan.
"It is definitely linked with my anxiety sure, but it's not so much as far as my anxiety now. Basically what happened was my doctor, we discussed it, and it was decided the way the plan was now just wasn't logistically healthy.
"So what can we do strategically to try and improve the chances of everybody being successful in this situation, my success and the Rockets success? If I fail then that's not good for them either, because it's an investment."
Jon Brockman (eye injury) and Carlos Delfino (visa delay) will also not be with the team for the start of camp.
The Houston Rockets have no further comments on the disclosed absences.